Note 9 - Long-Term Debt (Details) - Interest Expense (USD $) In Thousands, unless otherwise specified	3 Months Ended		12 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	May 31, 2013
Note 9 - Long-Term Debt (Details) - Interest Expense [Line Items]
Amortization of deferred financing costs	$ 1,556	$ 1,223
Interest rate swaps	258	267
Revolving Facility fees and interest	128	187
Interest accreted on contingent liability	67		104
Other interest	2
Interest expense	22,178	24,488
Notes [Member]
Note 9 - Long-Term Debt (Details) - Interest Expense [Line Items]
Interest expense including OID amortization	11,247	11,233
Term Loans [Member]
Note 9 - Long-Term Debt (Details) - Interest Expense [Line Items]
Interest expense including OID amortization	$ 8,920	$ 11,578