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Accrued Liabilities (Details) (USD $)
In Thousands, unless otherwise specified
Nov. 30, 2012
May 31, 2012
Accrued liabilities    
Payroll and related expenses $ 8,585 $ 7,754
Accrued severance 2,901 2,087
Deferred revenue 2,957 3,138
Royalties 1,913 2,258
Sales and franchise taxes 1,287 1,092
Interest rate swap at fair value 1,059  
Other 4,048 4,473
Total $ 22,750 $ 20,802