Note 10 - Long-term Debt (Details) - Long-term Debt - USD ($) $ in Thousands	Aug. 31, 2015	May. 31, 2015
Note 10 - Long-term Debt (Details) - Long-term Debt [Line Items]
Notes, net of $3,136 and $3,291 debt discounts, respectively	$ 396,864	$ 396,709
Revolving Facility	16,000
Capital lease agreements	3	7
	1,052,771	1,037,745
Less current portion, net of debt discounts	(20,437)	(4,469)
Long-term debt, net of current portion	1,032,334	1,033,276
Term Loan Facility [Member]
Note 10 - Long-term Debt (Details) - Long-term Debt [Line Items]
Term Loan Facility, net of $6,848 and $7,381 debt discounts, respectively	$ 639,904	$ 641,029