Schedule of Changes in Projected Benefit Obligations and Plan Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Change in projected benefit obligation:
Projected benefit obligation, beginning of period	$ 54,094	$ 42,575
Service cost	3,689	2,680
Interest cost	163	434
Participant contributions	1,262	1,046
Benefits received	1,743	1,567
Actuarial (gain) loss on obligation	(2,777)	8,071
Currency translation adjustment	1,344	(2,279)
Projected benefit obligation, end of period	59,518	54,094	$ 42,575
Change in plan assets:
Plan assets at fair value, beginning of period	35,857	32,509
Actual return on plan assets	805	431
Employer contributions	2,432	2,043
Participant contributions	1,262	1,046
Benefits received	1,743	1,567
Currency translation adjustment	891	(1,739)
Plan assets at fair value, end of period	42,990	35,857	32,509
Other non-current assets:
Deferred tax asset	3,496	3,857
Other non-current liabilities:
Underfunded pension liability	16,528	18,237
Amounts recognized in accumulated other comprehensive income, net of tax:
Pension adjustment	(2,514)	7,031	$ 2,244
Accumulated benefit obligation, end of period	$ 56,457	$ 50,772