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Fair Value Measurements (Details) (USD $)
In Millions, unless otherwise specified |
Oct. 27, 2012
item
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Jul. 28, 2012
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| Fair Value Measurements [Abstract] | ||
| Investments in ARS | 1 | |
| Book value, available-for-sale investments | $ 2.9 | |
| Par value, available-for-sale investments | 3.9 | |
| Amount by which fair value of available-for-sale securities is lower than cost basis | $ 1.0 | $ 1.2 |
| X | ||||||||||
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- Definition
Available For Sale Investments In Debt Securities Book Value No definition available.
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| X | ||||||||||
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- Definition
Available For Sale Investments In Debt Securities Par Value No definition available.
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| X | ||||||||||
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- Definition
Available for Sale Securities Amount of Carrying Value Exceeding Fair Value No definition available.
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| X | ||||||||||
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- Definition
Number Of Investments In Auction Rate Security No definition available.
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| X | ||||||||||
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- Details
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