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v3.20.1

Senior Notes (Detail) | Dec. 06, 2019 USD ($) | May 08, 2018 USD ($) | Jul. 14, 2010 USD ($) Contract | Mar. 31, 2020 USD ($) | Sep. 30, 2019 USD ($)
--- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |
Senior Notes, weighted average interest rate |  |  |  | 2.277% |
Carrying value of Senior Notes |  |  |  | $ 835,000,000 | $ 485,000,000
Fair value of Senior Notes |  |  |  | 818,880,000 | 514,121,000
Debt issuance costs |  |  |  | 11,400,000 | 5,200,000
July 2010 Senior Notes |  |  |  |  |
Debt Instrument [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 |  |
Senior Notes, weighted average interest rate |  |  | 5.60% |  |
Senior Notes, weighted average maturity (in years) |  |  | 10 years |  |
Net debt to EBITDA ratio maximum |  |  | 3.00 |  |
Fixed charge coverage ratio minimum |  |  | 2.50 |  |
Carrying value of Senior Notes |  |  |  | 85,000,000 | 85,000,000
Fair value of Senior Notes |  |  |  | 85,255,000 | 86,121,000
July 2010 Senior Notes | Minimum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Notes, maturity (in years) |  |  | 6 years |  |
July 2010 Senior Notes | Maximum |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Senior Notes, maturity (in years) |  |  | 10 years |  |
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 |  |  |  | 402,000,000 | 428,000,000
Debt instrument, maturity date |  | May 15, 2026 |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  | 5.25% |  |  |
Senior Notes December Six [Member] |  |  |  |  |
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 | 0
Fair value of Senior Notes |  |  |  | $ 331,625,000 | $ 0
Debt instrument, maturity date | Jun. 15, 2028 |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.00% |  |  |  |

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