Quarterly report pursuant to Section 13 or 15(d)

Acquisitions - Proforma Results of Operations (Detail)

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Acquisitions - Proforma Results of Operations (Detail) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended
Nov. 30, 2014
Nov. 30, 2013
Net sales    
Net sales, As reported $ 327,765us-gaap_SalesRevenueNet $ 339,556us-gaap_SalesRevenueNet
Net sales, Pro forma 327,765us-gaap_BusinessAcquisitionsProFormaRevenue 346,146us-gaap_BusinessAcquisitionsProFormaRevenue
Earnings from continuing operations    
Earnings from continuing operations, As reported 24,674us-gaap_IncomeLossFromContinuingOperations 33,005us-gaap_IncomeLossFromContinuingOperations
Earnings from continuing operations, Pro Forma $ 24,674us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax $ 32,916us-gaap_BusinessAcquisitionsProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTax
Basic earnings per share from continuing operations    
Basic earnings per share from continuing operations, As reported (in dollars per share) $ 0.38us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 0.45us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Basic earnings per share from continuing operations, Pro Forma (in dollars per share) $ 0.38us-gaap_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareBasic $ 0.45us-gaap_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareBasic
Diluted earnings per share from continuing operations    
Diluted earnings per share from continuing operations, As reported (in dollars per share) $ 0.38us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 0.44us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Diluted earnings per share from continuing operations, Pro Forma (in dollars per share) $ 0.38us-gaap_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted $ 0.44us-gaap_BusinessAcquisitionProFormaIncomeLossFromContinuingOperationsBeforeChangesInAccountingAndExtraordinaryItemsNetOfTaxPerShareDiluted