XML 43 R31.htm IDEA: XBRL DOCUMENT v3.3.1.900
Net Income Per Share - Computation of Basic and Diluted Net Income Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Numerator:        
Net income $ 35.0 $ 21.0 $ 58.8 $ 47.6
Denominator:        
Shares, basic 36.4 36.5 36.6 36.9
Effect of dilutive share-based awards 1.3 1.7 1.4 2.0
Shares, diluted 37.7 38.2 38.0 38.9
Net income per share:        
Basic $ 0.96 $ 0.57 $ 1.61 $ 1.29
Diluted $ 0.93 $ 0.55 $ 1.55 $ 1.22