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Post-Retirement Benefits - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Compensation And Retirement Disclosure [Abstract]
Contributions to the Compensation Plan by the employer	$ 0.8	$ 1.0	$ 1.6	$ 1.9
Contributions to the Compensation Plan by the employer in remainder of fiscal year 2018	$ 1.6		$ 1.6

X

- References

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- Definition

Amount of contribution received by defined benefit plan from employer which increases plan assets.

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Amount of contributions expected to be received by defined benefit plan from employer in fiscal year. Excludes contributions paid by employer in current fiscal year.

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