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Senior Notes (Detail) - USD ($) | Dec. 06, 2019 | May 08, 2018 | Jun. 30, 2021 | Sep. 30, 2020
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Carrying value of Senior Notes |  |  | $ 750,000,000 | $ 750,000,000
Fair value of Senior Notes |  |  | 808,625,000 | 800,750,000
Debt issuance costs |  |  | 9,400,000 | 10,600,000
May 2018 Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes issued in a private placement to a group of institutional investors |  | $ 400,000,000 |  |
Carrying value of Senior Notes |  |  | 400,000,000 | 400,000,000
Fair value of Senior Notes |  |  | 449,000,000 | 442,000,000
Debt instrument, maturity date |  | May 15, 2026 |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.25% |  |
Dec 2019 Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes issued in a private placement to a group of institutional investors | $ 350,000,000 |  |  |
Carrying value of Senior Notes |  |  | 350,000,000 | 350,000,000
Fair value of Senior Notes |  |  | $ 359,625,000 | $ 358,750,000
Debt instrument, maturity date | Jun. 15, 2028 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.00% |  |  |

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- Definition Including the current and noncurrent portions, carrying value as of the balance sheet date of Notes with the highest claim on the assets of the issuer in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle if longer). Senior note holders are paid off in full before any payments are made to junior note holders. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16(a)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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