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Share Capital, Option Plans and Share-Based Payments - RSU's, DSU's and ESPP (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Issuance of treasury stock (in shares) 411,276 409,922 434,156
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Units granted (in shares) 4,464 19,300 122,072
Award vesting period 3 years    
Stock issued $ 2.1 $ 1.5 $ 0.3
Stock issued (in shares) 98,625 70,000 30,000
Deferred Stock Units (DSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Units granted (in shares) 87,501 91,680 111,716
Employee Share Purchase Plan (ESPP)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Awards purchase price discount 15.00%    
Common shares eligible for issuance (in shares) 729,521 530,170 160,546
Cash received from employee stock purchase plan $ 21.5 $ 14.8 $ 5.5