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Share Repurchase (Details) (USD $) In Millions, except Share data, unless otherwise specified | Sep. 26, 2012 Share Repurchase Program 2011 [Member] | Apr. 30, 2011 Share Repurchase Program 2011 [Member] | Sep. 26, 2012 Share Repurchase Program 2012 [Member] | May 18, 2012 Share Repurchase Program 2012 [Member]
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Equity, Class of Treasury Stock [Line Items] |  |  |  |
Additional number of shares approved under stock repurchase program (in shares) |  | 6,000,000 |  | 6,000,000
Number of accumulated shares repurchased (in shares) | 6,000,000 |  | 135,843 |
Value of shares repurchased | $ 24.0 |  | $ 0.7 |
Remaining number of shares approved under stock repurchase program (in shares) |  |  | 5,900,000 |

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