Subsequent Events - (Details) (USD $)
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12 Months Ended | 0 Months Ended | ||
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Apr. 27, 2013
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Apr. 28, 2012
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Apr. 30, 2011
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May 23, 2013
Subsequent Event
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Subsequent Event [Line Items] | ||||
Cash dividend declared (usd per share) | $ 0.73 | $ 0.62 | $ 0.60 | $ 0.12 |