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Subsequent Events (Details) (USD $)
3 Months Ended 9 Months Ended 0 Months Ended
Jan. 31, 2015
Jan. 25, 2014
Jan. 31, 2015
Jan. 25, 2014
Mar. 06, 2015
Subsequent Event [Line Items]          
Cash dividend declared per share (in dollars per share) $ 0.100us-gaap_CommonStockDividendsPerShareDeclared $ 0.090us-gaap_CommonStockDividendsPerShareDeclared $ 0.300us-gaap_CommonStockDividendsPerShareDeclared $ 0.300us-gaap_CommonStockDividendsPerShareDeclared  
Subsequent Event [Member]          
Subsequent Event [Line Items]          
Cash dividend declared per share (in dollars per share)         $ 0.10us-gaap_CommonStockDividendsPerShareDeclared
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember