Fair Value Measurements - Estimated Fair Values of Convertible Notes (Detail) (USD $)
In Thousands, unless otherwise specified |
Mar. 30, 2013
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Sep. 29, 2012
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Estimated Fair Value Of Financial Instruments [Line Items] | ||
Estimated fair values of debt instruments | $ 1,859,900 | $ 1,767,900 |
2007 Notes [Member]
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Estimated Fair Value Of Financial Instruments [Line Items] | ||
Estimated fair values of debt instruments | 407,100 | 771,600 |
2010 Notes [Member]
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Estimated Fair Value Of Financial Instruments [Line Items] | ||
Estimated fair values of debt instruments | 541,100 | 505,600 |
2012 Notes [Member]
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Estimated Fair Value Of Financial Instruments [Line Items] | ||
Estimated fair values of debt instruments | 524,100 | 490,700 |
2013 Notes [Member]
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Estimated Fair Value Of Financial Instruments [Line Items] | ||
Estimated fair values of debt instruments | $ 387,600 |