Note 9 - Long-Term Debt (Detail) (USD $)	3 Months Ended	9 Months Ended					9 Months Ended		9 Months Ended		9 Months Ended					9 Months Ended		9 Months Ended							3 Months Ended	9 Months Ended
	Feb. 28, 2013	Feb. 28, 2013	Feb. 19, 2013	Jan. 03, 2013	May 31, 2012	Aug. 19, 2011	Feb. 28, 2013 Base Rate Borrowings [Member] Term Loan [Member]	Feb. 28, 2013 Base Rate Borrowings [Member] Federal Funds Effective Rate [Member]	Feb. 28, 2013 Base Rate Borrowings [Member] Revolving Facility [Member]	Feb. 28, 2013 LIBOR Rate [Member] Minimum [Member]	Feb. 28, 2013 LIBOR Rate [Member] Term Loan [Member]	Feb. 28, 2013 LIBOR Rate [Member] Revolving Facility [Member]	Feb. 28, 2013 LIBOR Rate [Member]	Feb. 28, 2013 Minimum [Member] Original Term Loan [Member]	Aug. 19, 2011 Minimum [Member]	Feb. 28, 2013 Term Loan [Member]	May 31, 2012 Term Loan [Member]	Feb. 28, 2013 Term B-1 Loans [Member]	Aug. 21, 2012 Term B-1 Loans [Member]	Aug. 19, 2012 Federal Funds Effective Rate [Member]	Feb. 28, 2013 LIBOR Rate [Member] Original Term Loan [Member]	Aug. 19, 2011 LIBOR Rate [Member]	Feb. 28, 2013 Base Rate Borrowings [Member] Original Term Loan [Member]	Aug. 19, 2011 Notes Payable, Other Payables [Member]	Feb. 28, 2013 Term B-2 Loans [Member]	Feb. 28, 2013 Term B-2 Loans [Member]	Mar. 28, 2013 Original Term Loan [Member]	Feb. 28, 2013 Original Term Loan [Member]
Gains (Losses) on Extinguishment of Debt	$ (2,425,000)	$ (9,111,000)														$ 3,486		$ 6,700,000							$ 2,400,000
Secured Long-term Debt, Noncurrent						615,000,000													610,400,000
Line of Credit Facility, Maximum Borrowing Capacity						100,000,000																			613,300,000	613,300,000
Letters of Credit Outstanding, Amount						25,000,000
Deferred Finance Costs, Current, Net																		4,000,000							1,700,000	1,700,000
Debt Instrument, Unamortized Discount																11,852,000	16,821,000	2,700,000							700,000	700,000
Debt Issuance Cost																		2,500,000							7,300,000
Line of Credit Facility, Increase, Additional Borrowings																										6,000,000
Line of Credit Facility, Remaining Borrowing Capacity	150,000,000	150,000,000
Debt Instrument, Interest Rate, Stated Percentage						11.125%				1.50%						0.25%												7.25%
Line of Credit Facility, Periodic Payment, Principal																										1,500,000
Debt Instrument, Basis Spread on Variable Rate								4.75%				5.75%	5.75%	1.25%						0.50%	4.50%	1.00%	3.50%					4.50%
Line of Credit Facility, Interest Rate at Period End	5.00%	5.00%													1.25%												5.75%
Line of Credit Facility, Interest Rate Description							2.75%		2.75%		3.75%	3.75%
Interest Rate Step Down	0.25%	0.25%
Line of Credit Facility, Amount Outstanding	21,000,000	21,000,000			0
Line of Credit Facility, Interest Rate During Period		4.95%
Line of Credit Facility, Covenant Terms		65%
Business Acquisition, Cost of Acquired Entity, Liabilities Incurred			50,000,000	50,000,000
Debt Instrument, Face Amount																								$ 400,000,000