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Share Capital, Option Plans and Share-Based Payments (Tables)
 3 Months Ended
Sep. 30, 2019
Share-based Payment Arrangement [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,
 
2019
 
2018
Stock options
$
2,010

 
$
2,602

Performance Share Units (issued under LTIP)
1,400

 
843

Restricted Share Units (issued under LTIP)
1,660

 
1,385

Restricted Share Units (other)
10

 
81

Deferred Share Units (directors)
751

 
661

Employee Share Purchase Plan
1,060

 
983

Total share-based compensation expense
$
6,891

 
$
6,555
Summary of Option Activity
A summary of activity under our stock option plans for the three months ended September 30, 2019 is as follows:
 
Options
 
Weighted-
Average Exercise
Price
 
Weighted-
Average
Remaining
Contractual Term
(years)
 
Aggregate Intrinsic  Value
($’000s)
Outstanding at June 30, 2019
7,102,753

 
$
31.82

 
 
 
 
Granted
745,710

 
38.76

 
 
 
 
Exercised
(183,680
)
 
24.91

 
 
 
 
Forfeited or expired
(76,394
)
 
34.19

 
 
 
 
Outstanding at September 30, 2019
7,588,389

 
$
32.64

 
4.17
 
$
61,988

Exercisable at September 30, 2019
2,936,341

 
$
28.37

 
2.78
 
$
36,520
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,
 
2019
 
2018
Weighted–average fair value of options granted
$
6.41

 
$
8.73

Weighted-average assumptions used:
 
 
 
Expected volatility
22.11
%
 
26.07
%
Risk–free interest rate
1.68
%
 
2.80
%
Expected dividend yield
1.68
%
 
1.45
%
Expected life (in years)
4.11

 
4.32

Forfeiture rate (based on historical rates)
7
%
 
6
%
Average exercise share price
$
38.76

 
$
39.27