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Carrying Value and Estimated Fair Value of Company's Long-Term Debt (Parenthetical) (Detail)
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12 Months Ended |
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Sep. 02, 2012
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5.5% Senior Notes due March 2017
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| Debt Instrument [Line Items] | |
| Loan interest rate, fixed | 5.50% |
| Debt instrument, principal due date | 2017-03 |
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5.3% Senior Notes due March 2012
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| Debt Instrument [Line Items] | |
| Loan interest rate, fixed | 5.30% |
| Debt instrument, principal due date | 2012-03 |