Note 9 - Long-Term Debt (Detail) - Interest Expense (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Aug. 19, 2011	Nov. 30, 2011	Nov. 30, 2012
Amortization of deferred financing costs	$ 1,166	$ 1,198	$ 0	$ 1,335	$ 2,389
Interest rate swaps	257	220	0	220	525
Revolving credit facility interest and fees	265	203	0	175	452
Other interest	2	80	0	80	4
Interest expense	22,251	24,850	0	28,243	46,739
Notes [Member]
Debt, including OID amortization	11,236	11,358	0	12,971	22,469
Term Loan [Member]
Debt, including OID amortization	$ 9,325	$ 11,791	$ 0	$ 13,462	$ 20,900