TREASURY UNITS (Details)				1 Months Ended	3 Months Ended				6 Months Ended	132 Months Ended	142 Months Ended
	Mar. 10, 2015 shares	Aug. 31, 2007 $ / item shares	Aug. 20, 2007 shares	Sep. 30, 2007 $ / item shares	Mar. 31, 2021 shares	Mar. 31, 2020 USD ($) shares	Mar. 31, 2019 $ / item shares	Dec. 31, 2007 $ / item shares	Jun. 30, 2019 $ / item shares	Dec. 31, 2018 $ / item shares	Jun. 30, 2019 USD ($) $ / item	Mar. 06, 2008 shares
Treasury units					58,469
Period for repurchase of depository receipts	5 years		12 months
Depository receipts authorized to be repurchased	2,000,000		300,000									1,500,000
Number of depository receipts repurchased		1,428,437		1,428,437				1,428,437	1,428,437	1,428,437
Repurchase price of depository receipts (in dollars per receipt) | $ / item											28.43
Units required to be repurchased (in shares)						219
Total cost of repurchase | $						$ 389,947					$ 44,718,000
General Partnership
Treasury units					585
Fixed distribution percentage of unit holders					1.00%
Number of depository receipts repurchased		188		188			188			188
Total cost of repurchase | $						$ 311,952
Treasury Units
Units required to be repurchased (in shares)						219
Class A
Treasury units					46,775
Fixed distribution percentage of unit holders					80.00%
Repurchase price of units (in dollars per unit) | $ / item		852.90		852.90			852.90			852.90
Total cost of repurchase | $						$ 74,095
Class B
Treasury units					11,109
Fixed distribution percentage of unit holders					19.00%
Number of depository receipts repurchased		3,572		3,572			3,572			3,572
Total cost of repurchase | $						$ 3,900
Class B | General Partnership
Repurchase price of units (in dollars per unit) | $ / item		1,033.00		1,033.00				1,033.00	1,033.00	1,033.00