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Subsequent Events (Details) - Restricted Stock Units (RSUs)
3 Months Ended
Aug. 04, 2015
shares
May. 11, 2015
shares
Jun. 30, 2015
shares
Jun. 30, 2014
shares
Subsequent Event [Line Items]        
Granted in period (in shares)   185,904 243,800 96,600
Subsequent Event        
Subsequent Event [Line Items]        
Granted in period (in shares) 2,075      
Number of common shares into which each RSU may be converted (in shares) 1      
Period following director's term in which RSUs may be settled 6 months