Note 9 - Long-Term Debt (Details) (USD $)	3 Months Ended	6 Months Ended			3 Months Ended			1 Months Ended		3 Months Ended						1 Months Ended
	Nov. 30, 2013	Nov. 30, 2012	Aug. 19, 2011	Feb. 28, 2013 Decrease [Member] Term Loan [Member]	Nov. 30, 2013 Base Rate Borrowing [Member] Revolving Facility [Member]	Nov. 30, 2013 LIBOR Rate [Member] Revolving Facility [Member]	Nov. 30, 2013 Per Quarter [Member] Term Loan [Member]	Sep. 30, 2013 Excess Cash Flow Requirement Terms [Member] Term Loan [Member]	Nov. 30, 2013 Notes Payable, Other Payables [Member]	Nov. 30, 2013 Federal Funds Effective Rate [Member]	Aug. 31, 2013 Federal Funds Effective Rate [Member]	Nov. 30, 2013 LIBOR Rate [Member]	Aug. 19, 2011 Revolving Credit Facility [Member]	Nov. 30, 2013 Senior Credit Facilities [Member]	Aug. 31, 2013 Senior Credit Facilities [Member]	Feb. 28, 2013 Term Loan [Member]	Nov. 30, 2013 Term Loan [Member]	Nov. 30, 2013 Minimum [Member]
Note 9 - Long-Term Debt (Details) [Line Items]
Secured Long-term Debt, Noncurrent (in Dollars)			$ 663,400,000
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars)													100,000,000
Letters of Credit Outstanding, Amount (in Dollars)													25,000,000
Debt Instrument, Interest Rate, Stated Percentage				0.75%					11.125%					1.25%	1.50%		5.00%
Gains (Losses) on Extinguishment of Debt (in Dollars)	(6,700,000)	(6,686,000)
Proceeds from Lines of Credit (in Dollars)		24,000,000														6,000,000
Debt Instrument, Basis Spread on Variable Rate											0.50%	1.00%
Line of Credit Facility, Interest Rate at Period End																		1.25%
Line of Credit Facility, Interest Rate Description	The applicable margin for borrowings under the Revolving Facility is subject to a 0.25% step-down, when the Company's senior secured net leverage ratio at the end of a fiscal quarter is less than or equal to 3:00 to 1:00.				2.75%	3.75%				2.75%		3.75%
Debt Instrument, Periodic Payment, Principal (in Dollars)							1,700,000
Repayments of Lines of Credit (in Dollars)		23,000,000						2,000,000
Debt Instrument, Face Amount (in Dollars)									$ 400,000,000