ALLOWANCE FOR CREDIT LOSSES, Amortized Cost Basis (Details) - USD ($) $ in Thousands		9 Months Ended
		Dec. 31, 2020		Mar. 31, 2020
Credit Risk Profile, Segregated by Class [Abstract]
2021	[1]	$ 161,582
2020	[1]	26,743
2019	[1]	6,183
2018	[1]	2,008
2017	[1]	375
Total	[1]	196,891
Transfers	[1],[2]	(90,641)
Net credit exposure	[1]	106,250
Unguaranteed residual value		12,314
Lease receivable and initial direct costs of notes receivable, net of amortization		464
Notes Receivable [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021		97,346
2020		10,897
2019		2,159
2018		892
2017		27
Total		111,321
Transfers	[2]	(67,294)
Net credit exposure		44,027
Unguaranteed residual value		0	[3]	$ 0	[4]
Lease receivable and initial direct costs of notes receivable, net of amortization	[5]	464		212
Lease Receivables [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021		64,236
2020		15,846
2019		4,024
2018		1,116
2017		348
Total		85,570
Transfers	[2]	(23,347)
Net credit exposure		62,223
Unguaranteed residual value		20,388	[3]	21,862	[4]
Lease receivable and initial direct costs of notes receivable, net of amortization	[5]	$ 0		$ 247
High CQR [Member] | Maximum [Member]
Credit Risk Profile, Segregated by Class [Abstract]
Loss rate on credit quality rating		1.00%
High CQR [Member] | Notes Receivable [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021		$ 82,424
2020		6,952
2019		1,259
2018		856
2017		27
Total		91,518
Transfers	[2]	(60,295)
Net credit exposure		31,223
High CQR [Member] | Lease Receivables [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021		39,177
2020		8,137
2019		2,273
2018		713
2017		299
Total		50,599
Transfers	[2]	(18,555)
Net credit exposure		$ 32,044
Average CQR [Member] | Minimum [Member]
Credit Risk Profile, Segregated by Class [Abstract]
Loss rate on credit quality rating		2.00%
Average CQR [Member] | Maximum [Member]
Credit Risk Profile, Segregated by Class [Abstract]
Loss rate on credit quality rating		10.00%
Average CQR [Member] | Notes Receivable [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021		$ 14,922
2020		3,945
2019		576
2018		36
2017		0
Total		19,479
Transfers	[2]	(6,999)
Net credit exposure		12,480
Average CQR [Member] | Lease Receivables [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021		25,059
2020		7,709
2019		1,751
2018		403
2017		49
Total		34,971
Transfers	[2]	(4,792)
Net credit exposure		$ 30,179
Low CQR [Member] | Minimum [Member]
Credit Risk Profile, Segregated by Class [Abstract]
Loss rate on credit quality rating		10.00%
Low CQR [Member] | Maximum [Member]
Credit Risk Profile, Segregated by Class [Abstract]
Loss rate on credit quality rating		100.00%
Low CQR [Member] | Notes Receivable [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021		$ 0
2020		0
2019		324
2018		0
2017		0
Total		324
Transfers	[2]	0
Net credit exposure		324
Low CQR [Member] | Lease Receivables [Member]
Credit Risk Profile, Segregated by Class [Abstract]
2021		0
2020		0
2019		0
2018		0
2017		0
Total		0
Transfers	[2]	0
Net credit exposure		$ 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.

[2] Transfers consist of receivables that have been transferred to third-party financial institutions on a non-recourse basis and receivables that are in the process of being transferred to third-party financial institutions.

[3] Includes unguaranteed residual values of $12,314 thousand that we retained after selling the related lease receivable.

[4] Includes unguaranteed residual values of $14,972 thousand for sales type leases, which have been sold and accounted for as sales.

[5] Refer to Note 7, “Allowance for Credit Losses” for details.