Note 10 - Long-term Debt (Details) - Interest Expense - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Aug. 31, 2015	Aug. 31, 2014	May. 31, 2015
Note 10 - Long-term Debt (Details) - Interest Expense [Line Items]
Amortization of deferred financing costs	$ 1,754	$ 1,649
Interest rate swaps and other interest	210	261
Revolving facility fees and interest	160	142
Interest accreted on contingent consideration liability	285	123	$ 914
Interest expense	22,492	22,298
Notes Payable, Other Payables [Member]
Note 10 - Long-term Debt (Details) - Interest Expense [Line Items]
Interest expense including OID amortization	11,279	11,262
Term Loan Facility [Member]
Note 10 - Long-term Debt (Details) - Interest Expense [Line Items]
Interest expense including OID amortization	$ 8,804	$ 8,861