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Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
May 31, 2014
May 31, 2013
Statement of Financial Position [Abstract]    
Accounts receivable, allowances $ 1,736us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 1,272us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Preferred stock, par value $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare $ 0.01us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized 5,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, shares issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Preferred stock, shares outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Common stock, par value $ 0.01us-gaap_CommonStockParOrStatedValuePerShare $ 0.01us-gaap_CommonStockParOrStatedValuePerShare
Shares of common stock 45,000,000us-gaap_CommonStockSharesAuthorized 45,000,000us-gaap_CommonStockSharesAuthorized
Common stock, shares issued 35,442,004us-gaap_CommonStockSharesIssued 35,442,004us-gaap_CommonStockSharesIssued
Common stock, shares outstanding 35,060,351us-gaap_CommonStockSharesOutstanding 35,060,351us-gaap_CommonStockSharesOutstanding
Treasury stock, shares 142,305us-gaap_TreasuryStockShares 142,305us-gaap_TreasuryStockShares