FINANCING RECEIVABLES AND OPERATING LEASES (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Sep. 30, 2018		Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017	Mar. 31, 2018		Mar. 31, 2017
Financing Receivables [Abstract]
Reserve for credit losses		$ (2,745)		$ (2,363)	$ (2,745)		$ (2,363)	$ (2,664)		$ (5,392)
Reported as [Abstract]
Current		86,253			86,253			69,936
Estimated unguaranteed residual values for direct financing lease		7,074			7,074			6,004
Accumulated amortization of initial direct cost		357			357			341
Investment in operating lease equipment - net [Abstract]
Cost of equipment under operating leases		20,738			20,738			15,683
Accumulated depreciation		(9,117)			(9,117)			(8,729)
Investment in operating lease equipment - net	[1]	11,621			11,621			6,954
Unguaranteed residual value of operating lease equipment net		2,931			2,931			1,921
Collateral for non-recourse notes payable - Finance receivables		61,800			61,800			52,000
Collateral for non-recourse notes payable - Operating leases		9,300			9,300			5,300
Gain on sale of financing receivables		1,200		1,200	2,500		3,500
Proceeds from sale of financing receivables		47,200		48,300	94,000		134,100
Contract liabilities - servicing of financial assets		400			400			500
Maximum potential future payments related guarantees		300			300
Notes Receivables [Member]
Financing Receivables [Abstract]
Minimum payments		72,585			72,585			62,992
Estimated unguaranteed residual value		0	[2]		0	[2]		0	[3]
Initial direct costs, net of amortization		629	[4]		629	[4]		375	[5]
Unearned income		0			0			0
Reserve for credit losses		(483)	[6]	(441)	(483)	[6]	(441)	(486)	[6]	(3,434)
Total, net		72,731			72,731			62,881
Reported as [Abstract]
Current		52,409			52,409			39,993
Long-term		20,322			20,322			22,888
Total, net		72,731			72,731			62,881
Lease-Related Receivables [Member]
Financing Receivables [Abstract]
Minimum payments		77,825			77,825			65,943
Estimated unguaranteed residual value		12,805	[2]		12,805	[2]		11,226	[3]
Initial direct costs, net of amortization		397	[4]		397	[4]		334	[5]
Unearned income		(9,409)			(9,409)			(8,251)
Reserve for credit losses		(598)	[6]	$ (648)	(598)	[6]	$ (648)	(640)	[6]	$ (679)
Total, net		81,020			81,020			68,612
Reported as [Abstract]
Current		33,844			33,844			29,943
Long-term		47,176			47,176			38,669
Total, net		81,020			81,020			68,612
Financing Receivables [Member]
Financing Receivables [Abstract]
Minimum payments		150,410			150,410			128,935
Estimated unguaranteed residual value		12,805	[2]		12,805	[2]		11,226	[3]
Initial direct costs, net of amortization		1,026	[4]		1,026	[4]		709	[5]
Unearned income		(9,409)			(9,409)			(8,251)
Reserve for credit losses	[6]	(1,081)			(1,081)			(1,126)
Total, net		153,751			153,751			131,493
Reported as [Abstract]
Current		86,253			86,253			69,936
Long-term		67,498			67,498			61,557
Total, net		$ 153,751			$ 153,751			$ 131,493

[1] Includes estimated unguaranteed residual values of $2,931 thousand and $1,921 thousand as of September 30, 2018 and March 31, 2018, respectively.

[2] Includes estimated unguaranteed residual values of $7,074 thousand for direct financing leases, which have been sold and accounted for as sales.

[3] Includes estimated unguaranteed residual values of $6,004 thousand for direct financing leases that have been sold and accounted for as sales.

[4] Initial direct costs are shown net of amortization of $357 thousand.

[5] Initial direct costs are shown net of amortization of $341 thousand.

[6] For details on reserve for credit losses, refer to Note 6, "Reserves for Credit Losses."