ALLOWANCE FOR CREDIT LOSSES, Amortized Cost Basis (Details) - USD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Credit Risk Profile, Segregated by Class [Abstract]    
2021 [1] $ 153,825  
2020 [1] 18,085  
2019 [1] 4,458  
2018 [1] 1,512  
2017 [1] 184  
Total [1] 178,064  
Transfers [1],[2] (78,427)  
Net credit exposure [1] 99,637  
Unguaranteed residual value 9,453  
Lease receivable and initial direct costs of notes receivable, net of amortization 425  
Notes Receivable [Member]    
Credit Risk Profile, Segregated by Class [Abstract]    
2021 101,482  
2020 8,718  
2019 1,643  
2018 779  
2017 19  
Total 112,641  
Transfers [2] (66,367)  
Net credit exposure 46,274  
Unguaranteed residual value 0 [3] $ 0 [4]
Lease receivable and initial direct costs of notes receivable, net of amortization 425 212
Lease Receivables [Member]    
Credit Risk Profile, Segregated by Class [Abstract]    
2021 52,343  
2020 9,367  
2019 2,815  
2018 733  
2017 165  
Total 65,423  
Transfers [2] (12,060)  
Net credit exposure 53,363  
Unguaranteed residual value 14,876 [3] 21,862 [4]
Lease receivable and initial direct costs of notes receivable, net of amortization $ 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 $ 93,793  
2020 6,250  
2019 769  
2018 771  
2017 19  
Total 101,602  
Transfers [2] (63,471)  
Net credit exposure 38,131  
High CQR [Member] | Lease Receivables [Member]    
Credit Risk Profile, Segregated by Class [Abstract]    
2021 28,898  
2020 5,885  
2019 1,798  
2018 463  
2017 125  
Total 37,169  
Transfers [2] (7,468)  
Net credit exposure $ 29,701  
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 $ 7,689  
2020 2,468  
2019 550  
2018 8  
2017 0  
Total 10,715  
Transfers [2] (2,896)  
Net credit exposure 7,819  
Average CQR [Member] | Lease Receivables [Member]    
Credit Risk Profile, Segregated by Class [Abstract]    
2021 23,445  
2020 3,482  
2019 1,017  
2018 270  
2017 40  
Total 28,254  
Transfers [2] (4,592)  
Net credit exposure $ 23,662  
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 $9,453 thousand that we retained after selling the related lease receivable and initial direct costs of notes receivable of $425 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 $9,453 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.