RESERVES FOR CREDIT LOSSES, CQR (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Mar. 31, 2018
Investment in Direct Financing and Sales-type Leases that are Past Due [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	$ 359	$ 483
Current	187	395
Unbilled minimum lease payments	76,279	65,065
Total minimum lease payments	76,825	65,943
Unearned income	(8,136)	(6,492)
Non-recourse notes payable	(46,310)	(33,219)
Net credit exposure	22,379	26,232
Notes Receivable [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	4,347	1,660
Current	1,863	3,656
Unbilled minimum lease payments	63,688	57,676
Total minimum lease payments	69,898	62,992
Non-recourse notes payable	(45,349)	(40,769)
Net credit exposure	$ 24,549	22,223
High CQR [Member] | Minimum [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Losses on net credit exposure	0.00%
High CQR [Member] | Maximum [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Losses on net credit exposure	5.00%
High CQR [Member] | Investment in Direct Financing and Sales-type Leases that are Past Due [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	$ 247	226
Current	128	224
Unbilled minimum lease payments	44,511	33,779
Total minimum lease payments	44,886	34,229
Unearned income	(5,497)	(3,743)
Non-recourse notes payable	(26,929)	(17,207)
Net credit exposure	12,460	13,279
High CQR [Member] | Notes Receivable [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	3,465	1,125
Current	1,824	3,262
Unbilled minimum lease payments	55,048	40,896
Total minimum lease payments	60,337	45,283
Non-recourse notes payable	(42,836)	(30,345)
Net credit exposure	$ 17,501	14,938
Average CQR [Member] | Minimum [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Losses on net credit exposure	2.00%
Average CQR [Member] | Maximum [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Losses on net credit exposure	15.00%
Average CQR [Member] | Investment in Direct Financing and Sales-type Leases that are Past Due [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	$ 112	257
Current	59	171
Unbilled minimum lease payments	31,768	31,286
Total minimum lease payments	31,939	31,714
Unearned income	(2,639)	(2,749)
Non-recourse notes payable	(19,381)	(16,012)
Net credit exposure	9,919	12,953
Average CQR [Member] | Notes Receivable [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	820	473
Current	39	394
Unbilled minimum lease payments	8,640	16,780
Total minimum lease payments	9,499	17,647
Non-recourse notes payable	(2,513)	(10,424)
Net credit exposure	$ 6,986	7,223
Low CQR [Member] | Minimum [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Losses on net credit exposure	15.00%
Low CQR [Member] | Maximum [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Losses on net credit exposure	100.00%
Low CQR [Member] | Investment in Direct Financing and Sales-type Leases that are Past Due [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	$ 0	0
Current	0	0
Unbilled minimum lease payments	0	0
Total minimum lease payments	0	0
Unearned income	0	0
Non-recourse notes payable	0	0
Net credit exposure	0	0
Low CQR [Member] | Notes Receivable [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	62	62
Current	0	0
Unbilled minimum lease payments	0	0
Total minimum lease payments	62	62
Non-recourse notes payable	0	0
Net credit exposure	62	62
31 to 60 Days Past Due [Member] | Investment in Direct Financing and Sales-type Leases that are Past Due [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	191	252
31 to 60 Days Past Due [Member] | Notes Receivable [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	3,057	217
31 to 60 Days Past Due [Member] | High CQR [Member] | Investment in Direct Financing and Sales-type Leases that are Past Due [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	155	143
31 to 60 Days Past Due [Member] | High CQR [Member] | Notes Receivable [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	2,905	175
31 to 60 Days Past Due [Member] | Average CQR [Member] | Investment in Direct Financing and Sales-type Leases that are Past Due [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	36	109
31 to 60 Days Past Due [Member] | Average CQR [Member] | Notes Receivable [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	152	42
31 to 60 Days Past Due [Member] | Low CQR [Member] | Investment in Direct Financing and Sales-type Leases that are Past Due [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	0	0
31 to 60 Days Past Due [Member] | Low CQR [Member] | Notes Receivable [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	0	0
61 to 90 Days Past Due [Member] | Investment in Direct Financing and Sales-type Leases that are Past Due [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	25	71
61 to 90 Days Past Due [Member] | Notes Receivable [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	7	936
61 to 90 Days Past Due [Member] | High CQR [Member] | Investment in Direct Financing and Sales-type Leases that are Past Due [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	22	40
61 to 90 Days Past Due [Member] | High CQR [Member] | Notes Receivable [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	0	527
61 to 90 Days Past Due [Member] | Average CQR [Member] | Investment in Direct Financing and Sales-type Leases that are Past Due [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	3	31
61 to 90 Days Past Due [Member] | Average CQR [Member] | Notes Receivable [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	7	409
61 to 90 Days Past Due [Member] | Low CQR [Member] | Investment in Direct Financing and Sales-type Leases that are Past Due [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	0	0
61 to 90 Days Past Due [Member] | Low CQR [Member] | Notes Receivable [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	0	0
Greater than 90 Days Past Due [Member] | Investment in Direct Financing and Sales-type Leases that are Past Due [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	143	160
Greater than 90 Days Past Due [Member] | Notes Receivable [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	1,283	507
Greater than 90 Days Past Due [Member] | High CQR [Member] | Investment in Direct Financing and Sales-type Leases that are Past Due [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	70	43
Greater than 90 Days Past Due [Member] | High CQR [Member] | Notes Receivable [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	560	423
Greater than 90 Days Past Due [Member] | Average CQR [Member] | Investment in Direct Financing and Sales-type Leases that are Past Due [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	73	117
Greater than 90 Days Past Due [Member] | Average CQR [Member] | Notes Receivable [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	661	22
Greater than 90 Days Past Due [Member] | Low CQR [Member] | Investment in Direct Financing and Sales-type Leases that are Past Due [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	0	0
Greater than 90 Days Past Due [Member] | Low CQR [Member] | Notes Receivable [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due	$ 62	$ 62