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Senior Notes - Additional Information (Detail) | Jul. 14, 2010 USD ($) Contract | May. 07, 2008 USD ($) Contract | Mar. 31, 2016 USD ($) | Sep. 30, 2015 USD ($)
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Senior Notes, weighted average interest rate |  |  | 1.815% |
Carrying value of Senior Notes |  |  | $ 376,000,000 | $ 376,000,000
Fair value of Senior Notes |  |  | $ 398,700,000 | $ 401,600,000
May 2008 senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes issued in a private placement to a group of institutional investors |  | $ 275,000,000 |  |
Number of series of Senior Notes issued | Contract |  | 4 |  |
Senior Notes, weighted average interest rate |  | 7.20% |  |
Senior Notes, weighted average maturity (in years) |  | 10 years |  |
May 2008 senior notes | Minimum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes, maturity (in years) |  | 5 years |  |
May 2008 senior notes | Maximum |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Senior Notes, maturity (in years) |  | 10 years |  |
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 | 5.20% |  |  |
Senior Notes, weighted average maturity (in years) | 8 years |  |  |
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 |  |  |

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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 + Details
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- Definition Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -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=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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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