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Significant Accounting Policies - Additional Information (Detail) (USD $) | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012 | Sep. 30, 2011
Regulatory Assets [Abstract] |  |  |
Liquid investments maximum maturity | Three months or less |  |
Inventories market valuation allowance | $ 1,800,000 | $ 2,800,000 |
Goodwill | 802,000 |  |
Impairment charges | 0 |  |
Total advertising and promotional expenses | 9,800,000 | 9,500,000 | 11,200,000
Net of related co-op assistance | $ 419,000 | $ 390,000 | $ 364,000

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=14024403&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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