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New Accounting Pronouncements - Additional Information (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
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Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016 | Sep. 30, 2015
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |
Reclassification of current deferred tax assets to noncurrent deferred tax assets | $ 21,075,000 |  |  |  | $ 21,075,000 | $ 27,517,000
Increase in deferred tax assets and retained earnings |  |  |  |  | 5,197,000 |
Payments for tax withholdings for equity awards previously recorded in operating activities |  |  |  |  | 80,000 | 541,000
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2015-17 [Member] |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |
Reclassification of current deferred tax assets to noncurrent deferred tax assets |  |  |  |  |  | 9,300,000
New Accounting Pronouncement, Early Adoption, Effect [Member] | Accounting Standards Update 2016-09 [Member] |  |  |  |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |  |  |  |
Increase in deferred tax assets and retained earnings |  |  |  |  | $ 5,200,000 |
Income tax benefit | $ 633,000 |  | $ 67,000 |  |  |
Additional income tax expense |  | $ 242,000 |  | $ 201,000 |  |
Payments for tax withholdings for equity awards previously recorded in operating activities |  |  |  |  |  | $ 541,000

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