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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
May 31, 2014
May 31, 2013
Accrued liabilities    
Payroll and related expenses $ 8,224 $ 6,491
Royalties 2,620 2,034
Accrued severance 765 1,602
Deferred revenue 200 1,573
Sales and franchise taxes 1,327 1,047
Interest rate swap liability 555 523
Other 3,071 3,156
Total $ 16,762 $ 16,426