FINANCING RECEIVABLES AND OPERATING LEASES (Details) - USD ($) $ in Thousands		3 Months Ended			9 Months Ended
		Dec. 31, 2018		Dec. 31, 2017	Dec. 31, 2018		Dec. 31, 2017	Mar. 31, 2018		Mar. 31, 2017
Financing Receivables [Abstract]
Reserve for credit losses		$ (2,612)		$ (2,516)	$ (2,612)		$ (2,516)	$ (2,664)		$ (5,392)
Reported as [Abstract]
Current		94,023			94,023			69,936
Estimated unguaranteed residual values for direct financing lease		8,407			8,407			6,004
Accumulated amortization of initial direct cost		313			313			341
Investment in operating lease equipment - net [Abstract]
Cost of equipment under operating leases		22,451			22,451			15,683
Accumulated depreciation		(9,974)			(9,974)			(8,729)
Investment in operating lease equipment - net	[1]	12,477			12,477			6,954
Unguaranteed residual value of operating lease equipment net		3,133			3,133			1,921
Collateral for non-recourse notes payable - Finance receivables		68,300			68,300			52,000
Collateral for non-recourse notes payable - Operating leases		8,500			8,500			5,300
Gain on sale of financing receivables		2,400		1,200	5,000		4,600
Proceeds from sale of financing receivables		95,200		32,800	189,200		166,900
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		69,898			69,898			62,992
Estimated unguaranteed residual value		0	[2]		0	[2]		0	[3]
Initial direct costs, net of amortization		582	[4]		582	[4]		375	[5]
Unearned income		0			0			0
Reserve for credit losses		(536)	[6]	(451)	(536)	[6]	(451)	(486)	[6]	(3,434)
Total, net		69,944			69,944			62,881
Reported as [Abstract]
Current		53,150			53,150			39,993
Long-term		16,794			16,794			22,888
Total, net		69,944			69,944			62,881
Lease-Related Receivables [Member]
Financing Receivables [Abstract]
Minimum payments		76,825			76,825			65,943
Estimated unguaranteed residual value		13,180	[2]		13,180	[2]		11,226	[3]
Initial direct costs, net of amortization		392	[4]		392	[4]		334	[5]
Unearned income		(10,228)			(10,228)			(8,251)
Reserve for credit losses		(509)	[6]	$ (621)	(509)	[6]	$ (621)	(640)	[6]	$ (679)
Total, net		79,660			79,660			68,612
Reported as [Abstract]
Current		40,873			40,873			29,943
Long-term		38,787			38,787			38,669
Total, net		79,660			79,660			68,612
Financing Receivables [Member]
Financing Receivables [Abstract]
Minimum payments		146,723			146,723			128,935
Estimated unguaranteed residual value		13,180	[2]		13,180	[2]		11,226	[3]
Initial direct costs, net of amortization		974	[4]		974	[4]		709	[5]
Unearned income		(10,228)			(10,228)			(8,251)
Reserve for credit losses	[6]	(1,045)			(1,045)			(1,126)
Total, net		149,604			149,604			131,493
Reported as [Abstract]
Current		94,023			94,023			69,936
Long-term		55,581			55,581			61,557
Total, net		$ 149,604			$ 149,604			$ 131,493

[1] Includes estimated unguaranteed residual values of $3,133 thousand and $1,921 thousand as of December 31, 2018 and March 31, 2018, respectively.

[2] Includes estimated unguaranteed residual values of $8,407 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 $313 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."