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Subsequent Event (Details) - USD ($)
1 Months Ended
Oct. 31, 2015
Apr. 30, 2015
Nov. 30, 2014
Subsequent Event [Line Items]      
Stock repurchase plan, authorized amount   2.30%  
Stock repurchase program, authorized amount   $ 50,000,000.0 $ 100,000,000
Subsequent Event      
Subsequent Event [Line Items]      
Stock repurchase plan, authorized amount 2.30%    
Stock repurchase program, authorized amount $ 50,000,000.0