SUBSEQUENT EVENTS (Details)		1 Months Ended		3 Months Ended	9 Months Ended		97 Months Ended
	Aug. 20, 2007 $ / item shares	Nov. 05, 2015 USD ($) $ / item shares	Nov. 03, 2015 USD ($) $ / item shares	Sep. 30, 2015 $ / item shares	Sep. 30, 2015 USD ($) $ / item shares	Sep. 30, 2014 USD ($) shares	Sep. 30, 2015 USD ($) $ / item shares
Subsequent events
Repurchase of depository receipts | shares					40,237		1,327,153
Repurchase price of depository receipts | $ / item					49.47		26.37
Repurchase price of units | $ / item	851.67			851.67	1,484.10
Repurchase of depository receipts					$ 2,018,329
Stock Buyback (in units) | shares					1,677	1,080
Total cost of repurchase					$ 2,516,061	$ 1,564,397	$ 37,682,000
Class B
Subsequent events
Repurchase of depository receipts | shares	2,770			2,770
Total cost of repurchase					472,845	290,698
General Partnership
Subsequent events
Repurchase of depository receipts | shares	146			146
Total cost of repurchase					$ 24,887	$ 15,300
Subsequent event
Subsequent events
Repurchase of depository receipts | shares		10,420	10,420
Repurchase price of depository receipts | $ / item		49.55	49.55
Repurchase price of units | $ / item		1,486.50	1,486.50
Repurchase of depository receipts		$ 524,967	$ 524,967
Subsequent event | Class B
Subsequent events
Stock Buyback (in units) | shares		82.5	82.5
Total cost of repurchase		$ 122,624	$ 122,624
Subsequent event | General Partnership
Subsequent events
Stock Buyback (in units) | shares		4.3	4.3
Total cost of repurchase		$ 6,454	$ 6,454