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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data, unless otherwise specified
Nov. 30, 2014
Aug. 31, 2014
Nov. 30, 2013
Condensed Consolidated Balance Sheets [Abstract]      
Receivables, allowance, current $ 2,530us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 2,857us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 3,349us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Receivables, allowance, noncurrent $ 2,017us-gaap_AllowanceForDoubtfulAccountsReceivableNoncurrent $ 2,000us-gaap_AllowanceForDoubtfulAccountsReceivableNoncurrent $ 0us-gaap_AllowanceForDoubtfulAccountsReceivableNoncurrent
Preferred stock, par value $ 1us-gaap_PreferredStockParOrStatedValuePerShare $ 1us-gaap_PreferredStockParOrStatedValuePerShare $ 1us-gaap_PreferredStockParOrStatedValuePerShare
Preferred stock, authorized 2,000,000us-gaap_PreferredStockSharesAuthorized 2,000,000us-gaap_PreferredStockSharesAuthorized 2,000,000us-gaap_PreferredStockSharesAuthorized
Preferred stock, outstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding 0us-gaap_PreferredStockSharesOutstanding
Preferred stock, issued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued 0us-gaap_PreferredStockSharesIssued
Common stock, par value $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare $ 1us-gaap_CommonStockParOrStatedValuePerShare
Common stock, authorized 25,000,000us-gaap_CommonStockSharesAuthorized 25,000,000us-gaap_CommonStockSharesAuthorized 25,000,000us-gaap_CommonStockSharesAuthorized
Common stock, issued 18,674,000us-gaap_CommonStockSharesIssued 18,636,000us-gaap_CommonStockSharesIssued 18,620,000us-gaap_CommonStockSharesIssued
Treasury stock, shares 6,578,000us-gaap_TreasuryStockShares 6,196,000us-gaap_TreasuryStockShares 5,698,000us-gaap_TreasuryStockShares