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Unaudited Pro Forma Results of Operations (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]    
Total sales $ 2,132,430 $ 2,040,271
Net income $ 40,903 $ 31,557