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Senior Notes (Detail) | May 08, 2018 USD ($) | Jul. 14, 2010 USD ($) Contract | Jun. 30, 2019 USD ($) | Sep. 30, 2018 USD ($)
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Senior Notes, weighted average interest rate |  |  | 3.781% |
Carrying value of Senior Notes |  |  | $ 513,000,000 | $ 513,000,000
Fair value of Senior Notes |  |  | 532,374,000 | 518,413,000
Debt issuance costs |  |  | 5,400,000 | 6,100,000
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 9 months 18 days |  |
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 |  |  | 114,374,000 | 114,413,000
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 |  |  | $ 418,000,000 | $ 404,000,000
Debt instrument, maturity date | May 15, 2026 |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 5.25% |  |  |

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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=119400593&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=6876686&loc=d3e534808-122878 + Details
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