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Note 13 - Fair Value (Details Textual) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Feb. 29, 2016	May. 31, 2015	Feb. 28, 2015	May. 31, 2014
Cas and Cash Equivalents [Member] \| Geographic Concentration Risk [Member] \| UNITED STATES
Concentration Risk, Percentage	26.00%	37.00%
Notes Payable, Other Payables [Member]
Long-term Debt, Fair Value	$ 295,300	$ 424,300
Term Loan Facility [Member]
Long-term Debt, Fair Value	588,700	653,300
Contingent Consideration [Member]
Business Combination, Contingent Consideration, Liability	19,400	18,600
Accrued Expenses and Other Current Liabilities [Member]
Business Combination, Contingent Consideration, Liability		100
Other Noncurrent Liabilities [Member]
Other Liabilities, Noncurrent		18,500
Cash and Cash Equivalents, at Carrying Value	12,190	18,363	$ 11,491	$ 23,621
Business Combination, Contingent Consideration, Liability	19,409	18,596		$ 11,300
Other Liabilities, Noncurrent	$ 30,765	$ 29,212