Note 9 - Long-Term Debt (Detail) (USD $)	6 Months Ended			6 Months Ended		6 Months Ended		6 Months Ended				6 Months Ended			6 Months Ended
	Nov. 30, 2012	May 31, 2012	Aug. 19, 2011	Nov. 30, 2012 Base Rate Borrowings [Member] Term Loan [Member]	Nov. 30, 2012 Base Rate Borrowings [Member] Federal Funds Effective Rate [Member]	Nov. 30, 2012 Base Rate Borrowings [Member] Revolving Facility [Member]	Nov. 30, 2012 LIBOR Rate [Member] Minimum [Member]	Nov. 30, 2012 LIBOR Rate [Member] Term Loan [Member]	Nov. 30, 2012 LIBOR Rate [Member] Revolving Facility [Member]	Nov. 30, 2012 LIBOR Rate [Member]	Aug. 19, 2011 Minimum [Member]	Nov. 30, 2012 Term Loan [Member]	Aug. 20, 2012 Term Loan [Member]	May 31, 2012 Term Loan [Member]	Nov. 30, 2012 Term B-1 Loans [Member]	Aug. 21, 2012 Term B-1 Loans [Member]	Aug. 19, 2012 Federal Funds Effective Rate [Member]	Aug. 19, 2011 LIBOR Rate [Member]	Nov. 30, 2012 Revolving Facility [Member]	Aug. 19, 2011 Notes Payable, Other Payables [Member]
Gains (Losses) on Extinguishment of Debt (in Dollars)	$ (6,686,000)											$ 2,733			$ 6,700,000
Secured Long-term Debt, Noncurrent (in Dollars)			615,000,000													610,400,000
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)			100,000,000
Letters of Credit Outstanding, Amount (in Dollars)			25,000,000
Deferred Finance Costs, Current, Net (in Dollars)															4,000,000
Debt Instrument, Unamortized Discount (in Dollars)												13,082,000		16,821,000	2,700,000
Debt Issuance Cost (in Dollars)															2,500,000
Line of Credit Facility, Remaining Borrowing Capacity (in Dollars)	150,000,000
Debt Instrument, Interest Rate, Stated Percentage			11.125%				1.50%					0.25%	7.25%
Debt Instrument, Periodic Payment (in Dollars)	1,500,000
Debt Instrument, Basis Spread on Variable Rate					4.75%				5.75%	5.75%							0.50%	1.00%
Line of Credit Facility, Interest Rate at Period End	5.75%										1.25%
Line of Credit Facility, Interest Rate Description				3.50%		3.50%		4.50%	4.50%
Interest Rate Step Down	0.25%
Line of Credit Facility, Amount Outstanding (in Dollars)	1,000,000	0																	1,000,000
Debt, Weighted Average Interest Rate	6.75%
Line of Credit Facility, Covenant Terms	65%
Debt Instrument, Face Amount (in Dollars)																				$ 400,000,000