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Share Capital, Option Plans and Share-Based Payments (Tables) | 9 Months Ended
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Mar. 31, 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 March 31, |  | Nine Months Ended March 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
Stock options | $ | 983 |  |  | $ | 2,365 |  |  | $ | 7,014 |  |  | $ | 9,040 |
Performance Share Units (issued under LTIP) | 751 |  |  | 926 |  |  | 2,723 |  |  | 2,754 |
Restricted Share Units (issued under LTIP) | 1,588 |  |  | 1,573 |  |  | 4,987 |  |  | 4,940 |
Restricted Share Units (other) | 146 |  |  | 534 |  |  | 823 |  |  | 2,029 |
Deferred Share Units (directors) | 701 |  |  | 558 |  |  | 2,193 |  |  | 1,899 |
Employee Share Purchase Plan | 911 |  |  | 705 |  |  | 2,733 |  |  | 1,711 |
Total share-based compensation expense | $ | 5,080 |  |  | $ | 6,661 |  |  | $ | 20,473 |  |  | $ | 22,373 |
Summary of Option Activity | A summary of activity under our stock option plans for the nine months ended March 31, 2018 is as follows:
| Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value ($’000s)
Outstanding at June 30, 2017 | 8,977,830 |  |  | $ | 24.57 |  |  |  |  |
Granted | 848,830 |  |  | 34.55 |  |  |  |  |
Exercised | (2,683,814 | ) |  | 18.68 |  |  |  |  |
Forfeited or expired | (296,166 | ) |  | 30.48 |  |  |  |  |
Outstanding at March 31, 2018 | 6,846,680 |  |  | $ | 27.86 |  |  | 4.48 |  | $ | 47,591 |
Exercisable at March 31, 2018 | 2,303,668 |  |  | $ | 23.91 |  |  | 3.22 |  | $ | 25,095 |
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 March 31, |  | Nine Months Ended March 31,
| 2018 |  | 2017 |  | 2018 |  | 2017
Weighted–average fair value of options granted | $ | 8.14 |  |  | $ | 7.32 |  |  | $ | 7.48 |  |  | $ | 6.86 |
Weighted-average assumptions used: |  |  |  |  |  |  |
Expected volatility | 26.95 | % |  | 27.64 | % |  | 27.10 | % |  | 28.61 | %
Risk–free interest rate | 2.44 | % |  | 1.70 | % |  | 1.83 | % |  | 1.32 | %
Expected dividend yield | 1.45 | % |  | 1.37 | % |  | 1.45 | % |  | 1.42 | %
Expected life (in years) | 4.33 |  |  | 4.34 |  |  | 4.42 |  |  | 4.33 |
Forfeiture rate (based on historical rates) | 6 | % |  | 5 | % |  | 6 | % |  | 5 | %
Average exercise share price | $ | 36.50 |  |  | $ | 33.48 |  |  | $ | 34.55 |  |  | $ | 31.34 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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