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Share Capital, Option Plans and Share-Based Payments - Long-Term Incentive Plans (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Issuance of treasury stock (in shares) | 544,929 |  | 379,111 |  | 547,897 | 387,443
Purchase of treasury stock | $ 12,800,000 |  | $ 0 |  | $ 24,534,000 | $ 0
Long Term Incentive Plan |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Term of plan |  |  |  |  | 3 years |
Compensation cost related to unvested awards not yet recognized | $ 19,000,000.0 |  |  |  | $ 19,000,000.0 |
Unvested stock awards compensation cost, weighted average recognition period |  |  |  |  | 2 years 1 month 6 days |
Fiscal 2018 LTIP |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Issuance of treasury stock (in shares) | 539,103 |  |  |  |  |
Purchase of treasury stock | $ 13,800,000 |  |  |  |  |
Treasury Stock |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Issuance of treasury stock (in shares) | 545,000 | 3,000 | 379,000 | 9,000 |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + 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 (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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