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Senior Notes - Additional Information (Detail) | Jul. 14, 2010 USD ($) Contract | Sep. 30, 2018 USD ($) | May 08, 2018 USD ($) | Sep. 30, 2017 USD ($) | May 07, 2008 USD ($) Contract
--- | --- | --- | --- | --- | ---
Debt Disclosure [Line Items] |  |  |  |  |
Debt Issuance Costs, Net |  | $ 6,100,000 |  | $ 200,000 |
May 2008 Senior Notes |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Senior Notes issued in a private placement to a group of institutional investors |  |  |  |  | $ 275,000,000
Number of series of Senior Notes issued | Contract |  |  |  |  | 4
July 2010 Senior Notes |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Senior Notes issued in a private placement to a group of institutional investors | $ 245,000,000 |  |  |  |
Number of series of Senior Notes issued | Contract | 4 |  |  |  |
Debt Instrument, Covenant, Leverage Ratio, Maximum | 3.00 |  |  |  |
Debt Instrument, Covenant, Fixed Charge Coverage Ratio, Minimum | 2.50 |  |  |  |
May 2018 Senior Notes |  |  |  |  |
Debt Disclosure [Line Items] |  |  |  |  |
Senior Notes issued in a private placement to a group of institutional investors |  |  | $ 400,000,000 |  |

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