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Principal Amounts Carrying Amounts and Fair Values of Senior Notes (Detail) (USD $) | Sep. 30, 2014 May 2008 senior notes | Sep. 30, 2013 May 2008 senior notes | May 07, 2008 May 2008 senior notes | Sep. 30, 2014 July 2010 senior notes | Sep. 30, 2013 July 2010 senior notes | Jul. 14, 2010 July 2010 senior notes
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Debt Instrument [Line Items] |  |  |  |  |  |
Principal | $ 202,000,000 | $ 210,000,000 | $ 275,000,000 | $ 245,000,000 | $ 245,000,000 | $ 245,000,000
Carrying Amounts | 202,000,000 | 210,000,000 |  | 245,000,000 | 245,000,000 |
Fair Value | $ 214,170,000 | $ 221,393,000 |  | $ 248,557,000 | $ 241,035,000 |

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- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13433-108611 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=28364263&loc=d3e13476-108611 + 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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: 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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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