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Share Capital, Option Plans and Share-Based Payments (Tables)
 3 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Share-based Compensation Costs Total share-based compensation expense for the periods indicated below is detailed as follows: 
 
Three Months Ended September 30,
 
2018
 
2017
Stock options
$
2,602

 
$
3,302

Performance Share Units (issued under LTIP)
843

 
1,035

Restricted Share Units (issued under LTIP)
1,385

 
1,886

Restricted Share Units (other)
81

 
479

Deferred Share Units (directors)
661

 
547

Employee Share Purchase Plan
983

 
986

Total share-based compensation expense
$
6,555

 
$
8,235
Summary of Option Activity A summary of activity under our stock option plans for the three months ended September 30, 2018 is as follows:
 
Options
 
Weighted-
Average Exercise
Price
 
Weighted-
Average
Remaining
Contractual Term
(years)
 
Aggregate Intrinsic  Value
($’000s)
Outstanding at June 30, 2018
7,078,435

 
$
28.41

 
 
 
 
Granted
750,220

 
39.27

 
 
 
 
Exercised
(494,134
)
 
25.16

 
 
 
 
Forfeited or expired
(155,148
)
 
32.05

 
 
 
 
Outstanding at September 30, 2018
7,179,373

 
$
29.69

 
4.49
 
$
57,829

Exercisable at September 30, 2018
2,570,581

 
$
25.26

 
3.14
 
$
32,850
Schedule of Weighted-Average Fair Value of Options and Weighted-Average Assumptions Used For the periods indicated, the weighted-average fair value of options and weighted-average assumptions were as follows:
 
Three Months Ended September 30,
 
2018
 
2017
Weighted–average fair value of options granted
$
8.73

 
$
7.44

Weighted-average assumptions used:
 
 
 
Expected volatility
26.07
%
 
27.35
%
Risk–free interest rate
2.80
%
 
1.74
%
Expected dividend yield
1.45
%
 
1.43
%
Expected life (in years)
4.32

 
4.34

Forfeiture rate (based on historical rates)
6
%
 
6
%
Average exercise share price
$
39.27

 
$
34.49