Summary of Significant Accounting Policies - Basic and Diluted Weighted Average Shares Outstanding (Detail) - shares shares in Thousands	12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Accounting Policies [Abstract]
Basic weighted-average shares outstanding	41,986	34,241	32,114
Effect of dilutive equity instruments	1,032	856	825
Diluted weighted-average shares outstanding	43,018	35,097	32,939