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Share-Based Compensation Unrecognized Compensation Expense and Period for Recognition (Details) (USD $)
In Millions, unless otherwise specified |
9 Months Ended |
|---|---|
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Oct. 27, 2012
Years
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Stock Options [Member]
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|
| Unrecognized Compensation Expense and Period for Recognition [Line Items] | |
| Unrecognized Share-based Compensation Expense | $ 17.6 |
| Unrecognized Share-based Compensation Expense, Period for Recognition | 1.3 |
|
Restricted Stock Units (RSUs) [Member]
|
|
| Unrecognized Compensation Expense and Period for Recognition [Line Items] | |
| Unrecognized Share-based Compensation Expense | $ 18.6 |
| Unrecognized Share-based Compensation Expense, Period for Recognition | 1.5 |