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New Accounting Pronouncements - Additional Information (Detail) - USD ($) | Jun. 30, 2019 | Oct. 01, 2018 | Sep. 30, 2018
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New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment to retained earnings, net of tax as a result of adopting new standard | $ 195,770,000 |  | $ 166,071,000
Accounting Standards Update 2014-09 [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |
New Accounting Pronouncements Or Change In Accounting Principle [Line Items] |  |  |
Cumulative effect adjustment to retained earnings, net of tax as a result of adopting new standard | $ 553,000 | $ 399,000 |

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