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.

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The cash outflow to reacquire common stock during the period.

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Number of treasury shares (units) reissued during the period, excluding reissuance of shares (units) held in treasury used to satisfy equity-based compensation obligations exercised by the holders of such rights. Upon reissuance of shares (units) from treasury, either the common or preferred stock (unit) reissued is outstanding.

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Share Capital, Option Plans and Share-Based Payments - Long-Term Incentive Plans (Details) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Issuance of treasury stock (in shares)		613,524	411,276	409,922
Purchase of treasury stock		$ 26,499,000	$ 0	$ 8,198,000
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		$ 13,300,000
Unvested stock awards compensation cost, weighted average recognition period		1 year 9 months 18 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)		614,000	411,000	410,000