| De langlopende schulden aan OCW/EZ. | nl | http://www.xbrl.org/2003/role/documentation | http://www.xbrl.org/2003/role/link |
| Noncurrent payables to OCW and EZ | en | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Langlopende schulden aan OCW/EZ | nl | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Payables to OCW and EZ | en | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |
| Schulden aan OCW/EZ | nl | http://www.xbrl.org/2003/role/terseLabel | http://www.xbrl.org/2003/role/link |