Summary of Significant Accounting Policies -Basic and Diluted Weighted Average Shares Outstanding (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Basic weighted-average shares outstanding (in shares)	46,844	43,773	46,685	40,573
Effect of dilutive equity instruments (in shares)	688	1,041	788	957
Diluted weighted-average shares outstanding (in shares)	47,532	44,814	47,473	41,530
Antidilutive securities excluded from computation of earnings per share (in shares)	33	9	302	13