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Supplemental Disclosure of Cash Flow Information (Parenthetical) (Detail) (8.875% Senior Notes) | Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
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8.875% Senior Notes |  |  |
Cash paid during the period for: |  |  |
Interest on senior notes | 8.875% | 8.875% | 8.875%

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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Balance Type: | na
Period Type: | instant

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- Details
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Balance Type: | na
Period Type: | duration