Stock-Based Compensation - Annual Performance-Based Awards Granted (Detail)	3 Months Ended
	Sep. 30, 2018 shares
FY2018 PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
PRSUs granted	185,056
Additional PRSUs earned pursuant to condition	20,116
FY2017 PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
PRSUs granted	193,420
Additional PRSUs earned pursuant to condition	73,065
FY2016 PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
PRSUs granted	208,160
Additional PRSUs earned pursuant to condition	110,944