Note 13 - Long-term Debt (Details) - Interest Expense - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
May. 31, 2015 |
May. 31, 2014 |
May. 31, 2013 |
|
| Note 13 - Long-term Debt (Details) - Interest Expense [Line Items] | |||
| Amortization of deferred financing costs | $ 6,719 | $ 6,333 | $ 5,107 |
| Interest rate swaps and other interest | 913 | 1,024 | 1,033 |
| Revolving facility fees and interest | 726 | 507 | 855 |
| Interest accreted on contingent consideration liability | 914 | 134 | 104 |
| Interest expense | 89,421 | 88,304 | 90,830 |
| Notes Payable, Other Payables [Member] | |||
| Note 13 - Long-term Debt (Details) - Interest Expense [Line Items] | |||
| Interest expense including OID amortization | 45,071 | 45,008 | 44,951 |
| Term Loan Facility [Member] | |||
| Note 13 - Long-term Debt (Details) - Interest Expense [Line Items] | |||
| Interest expense including OID amortization | $ 35,078 | $ 35,298 | $ 38,780 |