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Share Capital, Option Plans and Share-Based Payments (Tables) | 3 Months Ended
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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 |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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