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Nature of Business New Accounting Pronouncements (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Debt issuance costs, net | $ 328 |  | $ 376
Accounting Standards Update 2015-03 | Other Noncurrent Assets |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Debt issuance costs, net |  |  | (400)
Accounting Standards Update 2015-03 | Long-term Debt |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Debt issuance costs, net |  |  | $ 400
New Accounting Pronouncement, Early Adoption, Effect |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Employee service share-based compensation, tax benefit from compensation expense | $ 17,300 |  |
New Accounting Pronouncement, Early Adoption, Effect | Accounting Standard Updates 2016-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Excess tax benefit from share-based compensation, operating activities |  | $ 10,100 |
Excess tax benefits from share-based compensation, financing activities |  | $ 10,100 |

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- Definition Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 20 -Section 55 -Paragraph 24 -URI http://asc.fasb.org/extlink&oid=65896087&loc=d3e11374-113907 + Details
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