ALLOWANCE FOR CREDIT LOSSES, Aging Analysis (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Mar. 31, 2020
Age of the Recorded Notes Receivable Balance Disaggregated Based on Internally Assigned CQR [Abstract]
Total past due		$ 11,036
Current		12,423
Billed		23,459
Unbilled		173,432
Total	[1]	196,891
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		3,637	$ 2,155
Current		8,839	4,013
Billed		12,476
Unbilled		98,845
Total		111,321
Unbilled minimum lease payments			49,249
Total minimum lease payments		111,321	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		7,399	2,243
Current		3,584	2,287
Billed		10,983
Unbilled		74,587
Total		85,570
Unbilled minimum lease payments			64,962
Total minimum lease payments		89,629	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		91,518
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		50,599
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		19,479
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		34,971
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		324
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		4,678
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		406	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		4,272	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		4,096
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		2,264	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		1,832	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		2,262
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		967	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		$ 1,295	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 $12,314 thousand that we retained after selling the related lease receivable and initial direct costs of notes receivable of $464 thousand are excluded from amortized cost.