Supplemental Cash Flow Information (Schedule of Cash Paid for Interest and Income Taxes) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Supplemental Cash Flow Elements [Abstract]
Interest	$ 7,794	$ 2,970	$ 3,954
Income taxes, net of refunds	$ 7,912	$ 16,076	$ 25,459