CONDENSED BALANCE SHEETS [Parenthetical] - $ / shares	Sep. 30, 2016	Mar. 31, 2016
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	83,651,080	83,651,080
Units of limited partnership interest, outstanding	83,428,546	83,428,546
Series Twenty [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	3,866,700	3,866,700
Units of limited partnership interest, outstanding	3,843,500	3,843,500
Series Twenty One [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	1,892,700	1,892,700
Units of limited partnership interest, outstanding	1,881,000	1,881,000
Series Twenty Two [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	2,564,400	2,564,400
Units of limited partnership interest, outstanding	2,559,800	2,559,800
Series Twenty Three [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	3,336,727	3,336,727
Units of limited partnership interest, outstanding	3,323,327	3,323,327
Series Twenty Four [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	2,169,878	2,169,878
Units of limited partnership interest, outstanding	2,158,878	2,158,878
Series Twenty Five [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	3,026,109	3,026,109
Units of limited partnership interest, outstanding	3,020,309	3,020,309
Series Twenty Six [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	3,995,900	3,995,900
Units of limited partnership interest, outstanding	3,983,600	3,983,600
Series Twenty Seven [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	2,460,700	2,460,700
Units of limited partnership interest, outstanding	2,453,500	2,453,500
Series Twenty Eight [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	4,000,738	4,000,738
Units of limited partnership interest, outstanding	3,994,238	3,994,238
Series Twenty Nine [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	3,991,800	3,991,800
Units of limited partnership interest, outstanding	3,980,400	3,980,400
Series Thirty [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	2,651,000	2,651,000
Units of limited partnership interest, outstanding	2,636,000	2,636,000
Series Thirty One [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	4,417,857	4,417,857
Units of limited partnership interest, outstanding	4,396,557	4,396,557
Series Thirty Two [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	4,754,198	4,754,198
Units of limited partnership interest, outstanding	4,740,698	4,740,698
Series Thirty Three [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	2,636,533	2,636,533
Units of limited partnership interest, outstanding	2,628,033	2,628,033
Series Thirty Four [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	3,529,319	3,529,319
Units of limited partnership interest, outstanding	3,523,019	3,523,019
Series Thirty Five [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	3,300,463	3,300,463
Units of limited partnership interest, outstanding	3,293,763	3,293,763
Series Thirty Six [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	2,106,838	2,106,838
Units of limited partnership interest, outstanding	2,098,204	2,098,204
Series Thirty Seven [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	2,512,500	2,512,500
Units of limited partnership interest, outstanding	2,507,500	2,507,500
Series Thirty Eight [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	2,543,100	2,543,100
Units of limited partnership interest, outstanding	2,540,100	2,540,100
Series Thirty Nine [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	2,292,151	2,292,151
Units of limited partnership interest, outstanding	2,290,151	2,290,151
Series Forty [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	2,630,256	2,630,256
Units of limited partnership interest, outstanding	2,623,756	2,623,756
Series Forty One [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	2,891,626	2,891,626
Units of limited partnership interest, outstanding	2,891,626	2,891,626
Series Forty Two [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	2,744,262	2,744,262
Units of limited partnership interest, outstanding	2,736,262	2,736,262
Series Forty Three [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	3,637,987	3,637,987
Units of limited partnership interest, outstanding	3,637,987	3,637,987
Series Forty Four [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	2,701,973	2,701,973
Units of limited partnership interest, outstanding	2,699,973	2,699,973
Series Forty Five [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	4,014,367	4,014,367
Units of limited partnership interest, outstanding	4,014,367	4,014,367
Series Forty Six [Member]
Beneficial assignee certificate, par value (in dollars per share)	$ 10	$ 10
Units of limited partnership interest, authorized	101,500,000	101,500,000
Units of limited partnership interest, issued	2,980,998	2,980,998
Units of limited partnership interest, outstanding	2,971,998	2,971,998