| Profit (loss) | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Profit (loss) (after amendment dated 2014-03-28) | en | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| Profit | en | http://www.xbrl.org/2003/role/positiveLabel | http://www.xbrl.org/2003/role/link |
| Loss | en | http://www.xbrl.org/2003/role/negativeLabel | http://www.xbrl.org/2003/role/link |
| Profit (loss) | en | http://disclosure.edinet-fsa.go.jp/jppfs/ConsolidatedInterim/role/label | http://www.xbrl.org/2003/role/link |
| Profit (loss) | en | http://disclosure.edinet-fsa.go.jp/jppfs/ConsolidatedQuarterly/role/label | http://www.xbrl.org/2003/role/link |
| Profit (loss) | en | http://disclosure.edinet-fsa.go.jp/jppfs/NonConsolidatedInterim/role/label | http://www.xbrl.org/2003/role/link |
| Profit (loss) | en | http://disclosure.edinet-fsa.go.jp/jppfs/NonConsolidatedQuarterly/role/label | http://www.xbrl.org/2003/role/link |
| Profit | en | http://disclosure.edinet-fsa.go.jp/jppfs/ConsolidatedInterim/role/positiveLabel | http://www.xbrl.org/2003/role/link |
| Profit | en | http://disclosure.edinet-fsa.go.jp/jppfs/NonConsolidatedInterim/role/positiveLabel | http://www.xbrl.org/2003/role/link |
| Profit | en | http://disclosure.edinet-fsa.go.jp/jppfs/ConsolidatedQuarterly/role/positiveLabel | http://www.xbrl.org/2003/role/link |
| Profit | en | http://disclosure.edinet-fsa.go.jp/jppfs/NonConsolidatedQuarterly/role/positiveLabel | http://www.xbrl.org/2003/role/link |
| Loss | en | http://disclosure.edinet-fsa.go.jp/jppfs/ConsolidatedInterim/role/negativeLabel | http://www.xbrl.org/2003/role/link |
| Loss | en | http://disclosure.edinet-fsa.go.jp/jppfs/NonConsolidatedInterim/role/negativeLabel | http://www.xbrl.org/2003/role/link |
| Loss | en | http://disclosure.edinet-fsa.go.jp/jppfs/ConsolidatedQuarterly/role/negativeLabel | http://www.xbrl.org/2003/role/link |
| Loss | en | http://disclosure.edinet-fsa.go.jp/jppfs/NonConsolidatedQuarterly/role/negativeLabel | http://www.xbrl.org/2003/role/link |
| 当期純利益又は当期純損失(△) | ja | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| 当期純利益又は当期純損失(△)(平成26年3月28日財規等改正後) | ja | http://www.xbrl.org/2003/role/verboseLabel | http://www.xbrl.org/2003/role/link |
| 当期純利益 | ja | http://www.xbrl.org/2003/role/positiveLabel | http://www.xbrl.org/2003/role/link |
| 当期純損失(△) | ja | http://www.xbrl.org/2003/role/negativeLabel | http://www.xbrl.org/2003/role/link |
| 中間純利益又は中間純損失(△) | ja | http://disclosure.edinet-fsa.go.jp/jppfs/ConsolidatedInterim/role/label | http://www.xbrl.org/2003/role/link |
| 四半期純利益又は四半期純損失(△) | ja | http://disclosure.edinet-fsa.go.jp/jppfs/ConsolidatedQuarterly/role/label | http://www.xbrl.org/2003/role/link |
| 中間純利益又は中間純損失(△) | ja | http://disclosure.edinet-fsa.go.jp/jppfs/NonConsolidatedInterim/role/label | http://www.xbrl.org/2003/role/link |
| 四半期純利益又は四半期純損失(△) | ja | http://disclosure.edinet-fsa.go.jp/jppfs/NonConsolidatedQuarterly/role/label | http://www.xbrl.org/2003/role/link |
| 中間純利益 | ja | http://disclosure.edinet-fsa.go.jp/jppfs/ConsolidatedInterim/role/positiveLabel | http://www.xbrl.org/2003/role/link |
| 中間純利益 | ja | http://disclosure.edinet-fsa.go.jp/jppfs/NonConsolidatedInterim/role/positiveLabel | http://www.xbrl.org/2003/role/link |
| 四半期純利益 | ja | http://disclosure.edinet-fsa.go.jp/jppfs/ConsolidatedQuarterly/role/positiveLabel | http://www.xbrl.org/2003/role/link |
| 四半期純利益 | ja | http://disclosure.edinet-fsa.go.jp/jppfs/NonConsolidatedQuarterly/role/positiveLabel | http://www.xbrl.org/2003/role/link |
| 中間純損失(△) | ja | http://disclosure.edinet-fsa.go.jp/jppfs/ConsolidatedInterim/role/negativeLabel | http://www.xbrl.org/2003/role/link |
| 中間純損失(△) | ja | http://disclosure.edinet-fsa.go.jp/jppfs/NonConsolidatedInterim/role/negativeLabel | http://www.xbrl.org/2003/role/link |
| 四半期純損失(△) | ja | http://disclosure.edinet-fsa.go.jp/jppfs/ConsolidatedQuarterly/role/negativeLabel | http://www.xbrl.org/2003/role/link |
| 四半期純損失(△) | ja | http://disclosure.edinet-fsa.go.jp/jppfs/NonConsolidatedQuarterly/role/negativeLabel | http://www.xbrl.org/2003/role/link |