Earnings Per Share - Schedule of Reconciliation of Numerators and Denominators for Basic and Diluted Earnings Per Share Computations (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Sep. 29, 2018	Sep. 30, 2017
Numerator:
Net income	$ 28.2	$ 22.6
Denominator:
Weighted-average common shares outstanding	103.5	100.9
Dilutive effect of share-based awards	1.6	3.0
Weighted-average dilutive shares outstanding	105.1	103.9
Basic earnings per share	$ 0.27	$ 0.22
Diluted earnings per share	$ 0.27	$ 0.22