| Investment Sold, Not yet Purchased, Balance, Other Measure (Deprecated 2020-01-31) | en-US | http://www.xbrl.org/2003/role/label | http://www.xbrl.org/2003/role/link |
| Investment Sold, Not yet Purchased, Balance, Other Measure, Beginning Balance (Deprecated 2020-01-31) | en-US | http://www.xbrl.org/2003/role/periodStartLabel | http://www.xbrl.org/2003/role/link |
| Investment Sold, Not yet Purchased, Balance, Other Measure, Ending Balance (Deprecated 2020-01-31) | en-US | http://www.xbrl.org/2003/role/periodEndLabel | http://www.xbrl.org/2003/role/link |