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Share Capital, Option Plans and Share-Based Payments (Tables)
 6 Months Ended
Dec. 31, 2016
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 December 31,
 
Six Months Ended December 31,
 
2016
 
2015
 
2016
 
2015
Stock options
$
2,787

 
$
3,096

 
$
6,675

 
$
6,760

Performance Share Units (issued under LTIP)
947

 
727

 
1,828

 
1,347

Restricted Share Units (issued under LTIP)
1,765

 
1,370

 
3,367

 
2,604

Restricted Share Units (other)
743

 
330

 
1,495

 
711

Deferred Share Units (directors)
830

 
1,058

 
1,341

 
1,692

Employee Share Purchase Plan
500

 
—

 
1,006

 
—

Total share-based compensation expense
$
7,572

 
$
6,581

 
$
15,712

 
$
13,114
Summary of Option Activity
A summary of activity under our stock option plans, on a post share split basis, for the six months ended December 31, 2016 is as follows:
 
Options
 
Weighted-
Average Exercise
Price
 
Weighted-
Average
Remaining
Contractual Term
(years)
 
Aggregate Intrinsic  Value
($’000s)
Outstanding at June 30, 2016
8,354,816

 
$
21.94

 
 
 
 
Granted
924,974

 
29.83

 
 
 
 
Exercised
(203,714
)
 
21.89

 
 
 
 
Forfeited or expired
(46,396
)
 
20.16

 
 
 
 
Outstanding at December 31, 2016
9,029,680

 
$
22.76

 
4.32
 
$
73,589

Exercisable at December 31, 2016
3,580,466

 
$
18.57

 
3.14
 
$
44,188
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 December 31,
 
Six Months Ended December 31,
 
2016
 
2015
 
2016
 
2015
Weighted–average fair value of options granted
$
6.58

 
$
5.38

 
$
6.54

 
$
5.60

Weighted-average assumptions used:
 
 
 
 
 
 
 
Expected volatility
28.53
%
 
31.99
%
 
29.29
%
 
32.58
%
Risk–free interest rate
1.22
%
 
1.35
%
 
1.06
%
 
1.47
%
Expected dividend yield
1.43
%
 
1.70
%
 
1.45
%
 
1.64
%
Expected life (in years)
4.34

 
4.33

 
4.33

 
4.33

Forfeiture rate (based on historical rates)
5
%
 
5
%
 
5
%
 
5
%
Average exercise share price
$
30.37

 
$
22.68

 
$
29.83

 
$
22.85