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Share Capital, Option Plans and Share-Based Payments (Narrative) (Details) - USD ($) |  |  |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 26, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2014 | Jul. 28, 2015
Share-based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) |  |  |  |  | $ 0.83 | $ 0.7175 | $ 0.6225 |
Payments of dividends to shareholders |  |  |  |  | $ (99,262,000) | $ (87,629,000) | $ (74,693,000) |
Preference shares issued (in shares) |  |  |  |  | 0 |  |  |
Common shares repurchased (in shares) |  |  |  |  | 225,000 | 240,222 | 25,760 |
Purchase of treasury stock |  |  |  |  | $ 10,627,000 | $ 10,557,000 | $ 1,275,000 |
Amount authorized to be repurchased (up to) |  |  |  |  |  |  |  | $ 200,000,000
Common shares repurchased and cancelled during period, shares (in shares) |  |  |  |  | 1,476,248 |  |  |
Common shares repurchased and cancelled during period, value |  |  |  |  | $ 65,509,000 | $ 0 | $ 0 |
Options outstanding (in shares) |  |  |  |  | 4,177,408 | 4,375,365 | 4,273,226 |
Unrecognized compensation cost relating to unvested stock awards |  |  |  |  | $ 24,700,000 |  |  |
Unvested stock awards compensation cost, weighted average recognition period |  |  |  |  | 2 years 3 months 19 days |  |  |
Cash proceeds from exercise of options granted |  |  |  |  | $ 14,600,000 | $ 12,200,000 | $ 22,200,000 |
Tax benefit realized from exercise of options |  |  |  |  | 800,000 | 1,000,000 | 1,800,000 |
Issuance of treasury stock |  |  |  |  | $ 0 | $ 0 | $ 0 |
Stock Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Options outstanding (in shares) |  |  |  |  | 4,177,408 |  |  |
Common shares available for issuance (in shares) |  |  |  |  | 2,749,830 |  |  |
Expire period of options, minimum term |  |  |  |  | 7 years |  |  |
Expire period of options, maximum term |  |  |  |  | 10 years |  |  |
Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Issuance of treasury stock (in shares) |  |  |  |  | 15,000 | 22,222 | 22,222 |
Award vesting period |  |  |  |  | 3 years |  |  |
Issuance of treasury stock |  |  |  |  | $ 300,000 | $ 1,300,000 | $ 500,000 |
Units granted (in shares) |  |  |  |  | 61,036 | 45,000 | 0 |
Deferred Stock Units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Units granted (in shares) |  |  |  |  | 55,858 | 38,052 | 42,298 |
2015 Long Term Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Issuance of treasury stock (in shares) |  |  |  | 202,078 |  |  |  |
Issuance of treasury stock |  |  |  | $ 5,000,000 |  |  |  |
Long Term Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Issuance of treasury stock (in shares) |  |  |  |  | 217,078 | 377,775 | 484,238 |
Unvested stock awards compensation cost, weighted average recognition period |  |  |  |  | 1 year 10 months |  |  |
Compensation cost related to unvested awards not yet recognized |  |  |  |  | $ 12,900,000 |  |  |
Employee Share Purchase Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Awards purchase price discount |  | 15.00% | 5.00% |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  |  |  | 80,273 |  |  |
Cash received from employee stock purchase plan |  |  |  |  | $ 5,500,000 | $ 3,100,000 | $ 2,600,000 |
Minimum | Stock Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 4 years |  |  |
Maximum | Stock Options |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 5 years |  |  |
Accumulated Retained Earnings |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Common shares repurchased and cancelled during period, value |  |  |  |  | $ 55,684,000 |  |  |
Subsequent Event |  |  |  |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Dividends declared per common share (in dollars per share) | $ 0.23 |  |  |  |  |  |  |
Amount authorized to be repurchased (up to) | $ 200,000,000 |  |  |  |  |  |  |

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