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Senior Notes (Detail) | May 08, 2018 USD ($) | Jul. 14, 2010 USD ($) Contract | Jun. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | May 07, 2008 USD ($)
--- | --- | --- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |  |  |
Senior Notes, weighted average interest rate |  |  | 3.201% |  |  |
Carrying value of Senior Notes |  |  | $ 506,713,000 | $ 243,801,000 |  |
Fair value of Senior Notes |  |  | 510,679,000 | 253,157,000 |  |
Debt issuance costs |  |  | (6,287,000) | (199,000) |  |
May 2008 Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Senior Notes issued in a private placement to a group of institutional investors |  |  |  |  |  | $ 275,000,000
Carrying value of Senior Notes |  |  | 0 | 131,000,000 |  |
Fair value of Senior Notes |  |  | 0 | 134,250,000 |  |
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) |  | 9 years 10 months |  |  |  |
Net debt to EBITDA ratio maximum |  | 3.00 |  |  |  |
Fixed charge coverage ratio minimum |  | 2.50 |  |  |  |
Carrying value of Senior Notes |  |  | 113,000,000 | 113,000,000 |  |
Fair value of Senior Notes |  |  | 114,966,000 | $ 119,106,000 |  |
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 |  | $ 0 |
Fair value of Senior Notes |  |  | $ 402,000,000 |  | $ 0 |
Debt instrument, maturity date | May 15, 2026 |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.25% |  |  |  |  |

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