Supplemental Cash Flow Information (Narrative) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Supplemental Cash Flow Information [Line Items]
Environmental remediation costs and property held for sale	$ 284	$ 294	$ 726
Measurement period adjustments to goodwill			$ 1,578
Contingent earn out liability	$ 2,580
Citron and Lucid | December 21, 2019
Supplemental Cash Flow Information [Line Items]
Number of shares to be issued	5,122
Fair market value of shares of common stock issued in acquisition	$ 90,400
Citron and Lucid | December 21, 2021
Supplemental Cash Flow Information [Line Items]
Unsecured deferred payment payable	$ 50,000