COMMITMENTS AND CONTINGENCIES (Schedule of Future Minimum Lease Commitments) (Details)	May 31, 2016 USD ($)
COMMITMENTS AND CONTINGENCIES [Abstract]
2017	$ 10,982,000	[1]
2018	11,234,000	[1]
2019	10,907,000	[1]
2020	10,428,000	[1]
2021	9,141,000	[1]
Thereafter	62,841,000	[1]
Total	115,533,000	[1]
Sub-lease income	$ 236,000

[1] Operating lease obligations have been reduced by approximately $236,000 to reflect sub-lease income. Certain obligations under leasing arrangements are collateralized by the underlying asset being leased.