Note 9 - Long-Term Debt (Details) - Interest Expense (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Nov. 30, 2013	Nov. 30, 2012	May 31, 2013
Note 9 - Long-Term Debt (Details) - Interest Expense [Line Items]
Amortization of deferred financing costs	$ 1,580	$ 1,166	$ 3,136	$ 2,389
Interest rate swaps	262	257	520	525
Revolving Facility fees and interest	126	265	254	452
Interest accreted on contingent liability	67		134		104
Other interest	2	2	4	4
Interest expense	22,093	22,251	44,271	46,739
Notes [Member]
Note 9 - Long-Term Debt (Details) - Interest Expense [Line Items]
Interest expense including OID amortization	11,250	11,236	22,497	22,469
Term Loans [Member]
Note 9 - Long-Term Debt (Details) - Interest Expense [Line Items]
Interest expense including OID amortization	$ 8,806	$ 9,325	$ 17,726	$ 20,900