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Share Capital, Option Plans and Share-Based Payments (Tables) | 9 Months Ended
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Mar. 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 March 31, |  | Nine Months Ended March 31,
|  | 2016 |  | 2015 |  | 2016 |  | 2015
Stock options |  | $ | 3,025 |  |  | $ | 3,461 |  |  | $ | 9,785 |  |  | $ | 8,875 |
Performance Share Units (issued under LTIP) |  | 610 |  |  | 600 |  |  | 1,957 |  |  | 1,745 |
Restricted Share Units (issued under LTIP) |  | 1,150 |  |  | 1,287 |  |  | 3,754 |  |  | 3,391 |
Restricted Share Units (other) |  | 330 |  |  | 320 |  |  | 1,041 |  |  | 564 |
Deferred Share Units (directors) |  | 533 |  |  | 894 |  |  | 2,225 |  |  | 1,365 |
Employee Share Purchase Plan |  | 318 |  |  | — |  |  | 318 |  |  | — |
Total share-based compensation expense |  | $ | 5,966 |  |  | $ | 6,562 |  |  | $ | 19,080 |  |  | $ | 15,940 |
Summary of Option Activity | A summary of activity under our stock option plans for the nine months ended March 31, 2016 is as follows:
| Options |  | Weighted- Average Exercise Price |  | Weighted- Average Remaining Contractual Term (years) |  | Aggregate Intrinsic Value ($’000s)
Outstanding at June 30, 2015 | 4,375,365 |  |  | $ | 42.26 |  |  |  |  |
Granted | 585,140 |  |  | 46.13 |  |  |  |  |
Exercised | (324,702 | ) |  | 25.57 |  |  |  |  |
Forfeited or expired | (421,363 | ) |  | 48.87 |  |  |  |  |
Outstanding at March 31, 2016 | 4,214,440 |  |  | $ | 43.42 |  |  | 4.67 |  | $ | 38,565 |
Exercisable at March 31, 2016 | 1,605,470 |  |  | $ | 37.13 |  |  | 3.61 |  | $ | 24,015 |
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,
| 2016 |  | 2015 |  | 2016 |  | 2015
Weighted–average fair value of options granted | $ | 10.81 |  |  | $ | 13.35 |  |  | $ | 11.06 |  |  | $ | 13.59 |
Weighted-average assumptions used: |  |  |  |  |  |  |
Expected volatility | 31.53 | % |  | 31.68 | % |  | 32.23 | % |  | 31.94 | %
Risk–free interest rate | 1.08 | % |  | 1.14 | % |  | 1.34 | % |  | 1.43 | %
Expected dividend yield | 1.70 | % |  | 1.27 | % |  | 1.66 | % |  | 1.20 | %
Expected life (in years) | 4.33 |  |  | 4.33 |  |  | 4.33 |  |  | 4.33 |
Forfeiture rate (based on historical rates) | 5 | % |  | 5 | % |  | 5 | % |  | 5 | %
Average exercise share price | $ | 47.01 |  |  | $ | 54.17 |  |  | $ | 46.13 |  |  | $ | 54.57 |

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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=6415400&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=6415400&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=6415400&loc=d3e5070-113901 + Details
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