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Unaudited Pro Forma Results of Operations (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
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Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |
Total sales | $ 326,511 | $ 319,784 | $ 1,910,068 | $ 1,808,630
Net income (loss) | $ (9,592) | $ (9,445) | $ 66,731 | $ 47,546

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