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Contingencies and Commitments - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract] |  |  |
Committed future sublease income, 2016 | $ 1,067 |  |
Committed future sublease income, 2017 | 306 |  |
Committed future sublease income, 2018 | 317 |  |
Committed future sublease income, 2019 | 219 |  |
Rent expense, net of sublease income | $ 47,032 | $ 45,032 | $ 45,610
Product warranty, limited warranty period offered | 90 days |  |

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- Definition Future rental payments receivable within one year of the balance sheet date under an operating lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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- Definition Future rental payments receivable within the third year from the balance sheet date under an operating lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718 + Details
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