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Quarterly Results (Unaudited) - Summary of Quarterly Results of Operations (Parenthetical) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
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Sep. 30, 2012 | Jul. 01, 2012 | Apr. 01, 2012 | Jan. 01, 2012 | Sep. 30, 2011 | Jul. 03, 2011 | Apr. 03, 2011 | Jan. 02, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2010
Quarterly Results Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common and participating preferred stockholders | $ 159,091 | $ (149,080) | $ (3,855) | $ 23,759 | $ (107,095) | $ 211,341 | $ (61,950) | $ (20,070) | $ 29,915 | $ 22,226 | $ (151,869)
Basic | $ 0.79 | $ (1.07) | $ (0.02) | $ 0.12 | $ (0.77) | $ 1.16 | $ (0.45) | $ (0.14) | $ 0.15 | $ 0.11 | $ (1.15)
Bargain purchase gain |  |  | 7,264 |  |  |  |  |  |  |  |
Previously Reported [Member] |  |  |  |  |  |  |  |  |  |  |
Quarterly Results Of Operations [Line Items] |  |  |  |  |  |  |  |  |  |  |
Net income (loss) attributable to common and participating preferred stockholders |  |  | $ 204,077 |  |  |  |  |  |  |  |
Basic |  |  | $ 1.12 |  |  |  |  |  |  |  |

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