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Note 12 - Fair Value (Details Textual) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Nov. 30, 2015	May. 31, 2015	Aug. 31, 2015	Nov. 30, 2014	May. 31, 2014
Cas and Cash Equivalents [Member] \| Geographic Concentration Risk [Member] \| UNITED STATES
Concentration Risk, Percentage	41.00%	37.00%
Notes Payable, Other Payables [Member]
Long-term Debt, Fair Value	$ 407,300	$ 424,300
Term Loan Facility [Member]
Long-term Debt, Fair Value	622,500	653,300
Contingent Consideration [Member]
Business Combination, Contingent Consideration, Liability	19,100	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	15,067	18,363		$ 15,105	$ 23,621
Business Combination, Contingent Consideration, Liability	19,127	18,596	$ 18,596		$ 11,300
Other Liabilities, Noncurrent	$ 30,344	$ 29,212