ALLOWANCE FOR CREDIT LOSSES, Aging Analysis (Details) - USD ($) $ in Thousands		Sep. 30, 2020	Mar. 31, 2020
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due		$ 6,498
Current		11,859
Billed		18,357
Unbilled		144,585
Total	[1]	162,942
Non-recourse notes payable		(275,000)
Notes Receivable [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due		2,018	$ 2,155
Current		10,105	4,013
Billed		12,123
Unbilled		77,879
Total		90,002
Unbilled minimum lease payments			49,249
Total minimum lease payments		90,002	55,417
Non-recourse notes payable			(34,977)
Net credit exposure			20,440
Lease Receivables [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due		4,480	2,243
Current		1,754	2,287
Billed		6,234
Unbilled		66,706
Total		72,940
Unbilled minimum lease payments			64,962
Total minimum lease payments		76,700	69,492
Unearned income			(8,412)
Non-recourse notes payable			(38,516)
Net credit exposure			22,564
High CQR [Member] | Notes Receivable [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due			1,614
Current			2,878
Total		77,841
Unbilled minimum lease payments			29,057
Total minimum lease payments			33,549
Non-recourse notes payable			(18,341)
Net credit exposure			15,208
High CQR [Member] | Lease Receivables [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due			1,978
Current			1,181
Total		38,405
Unbilled minimum lease payments			33,581
Total minimum lease payments			36,740
Unearned income			(4,766)
Non-recourse notes payable			(19,823)
Net credit exposure			12,151
Average CQR [Member] | Notes Receivable [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due			326
Current			1,135
Total		11,775
Unbilled minimum lease payments			19,995
Total minimum lease payments			21,456
Non-recourse notes payable			(16,636)
Net credit exposure			4,820
Average CQR [Member] | Lease Receivables [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due			265
Current			1,106
Total		34,535
Unbilled minimum lease payments			31,381
Total minimum lease payments			32,752
Unearned income			(3,646)
Non-recourse notes payable			(18,693)
Net credit exposure			10,413
Low CQR [Member] | Notes Receivable [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due			215
Current			0
Total		386
Unbilled minimum lease payments			197
Total minimum lease payments			412
Non-recourse notes payable			0
Net credit exposure			412
Low CQR [Member] | Lease Receivables [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due			0
Current			0
Total		0
Unbilled minimum lease payments			0
Total minimum lease payments			0
Unearned income			0
Non-recourse notes payable			0
Net credit exposure			0
31 to 60 Days Past Due [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due		1,585
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		925	1,535
31 to 60 Days Past Due [Member] | Lease Receivables [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due		660	997
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			1,332
31 to 60 Days Past Due [Member] | High CQR [Member] | Lease Receivables [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due			951
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			140
31 to 60 Days Past Due [Member] | Average CQR [Member] | Lease Receivables [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due			46
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			63
31 to 60 Days Past Due [Member] | Low CQR [Member] | Lease Receivables [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due			0
61 to 90 Days Past Due [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due		2,319
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		270	46
61 to 90 Days Past Due [Member] | Lease Receivables [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due		2,049	212
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			2
61 to 90 Days Past Due [Member] | High CQR [Member] | Lease Receivables [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due			105
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			44
61 to 90 Days Past Due [Member] | Average CQR [Member] | Lease Receivables [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due			107
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
61 to 90 Days Past Due [Member] | Low CQR [Member] | Lease Receivables [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due			0
Greater than 90 Days Past Due [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due		2,594
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		823	574
Greater than 90 Days Past Due [Member] | Lease Receivables [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due		$ 1,771	1,034
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			280
Greater than 90 Days Past Due [Member] | High CQR [Member] | Lease Receivables [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due			922
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			142
Greater than 90 Days Past Due [Member] | Average CQR [Member] | Lease Receivables [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due			112
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			152
Greater than 90 Days Past Due [Member] | Low CQR [Member] | Lease Receivables [Member]
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due			$ 0

[1] Unguaranteed residual values of $12,644 thousand that we retained after selling the related lease receivable and initial direct costs of notes receivable of $364 thousand are excluded from amortized cost.