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Share-Based Compensation - Balance and Aggregate Intrinsic Value of Stock Units (Detail)
$ / shares in Units, $ in Millions
12 Months Ended
Jun. 30, 2018
USD ($)
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Stock Unit Awards, Granted 300,071
Stock Unit Awards, Performance adjustment (68,003)
Deferred stock units outstanding [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Stock Unit Awards Outstanding, Balance at June 30, 2017 1,320,798
Stock Unit Awards, Granted 1,331,073
Stock Unit Awards, Delivered (545,028)
Stock Unit Awards, Forfeited (253,285)
Stock Unit Awards Outstanding, Balance at June 30, 2018 1,853,558
Aggregate Intrinsic Value, Balance at June 30, 2018 | $ $ 93.4
Weighted Average Grant Date Fair Value, Balance at June 30, 2017 | $ / shares $ 69.14
Weighted Average Grant Date Fair Value, Granted | $ / shares 40.52
Weighted Average Grant Date Fair Value, Delivered | $ / shares 70.26
Weighted Average Grant Date Fair Value, Forfeited | $ / shares 58.42
Weighted Average Grant Date Fair Value, Balance at June 30, 2018 | $ / shares $ 49.75
Market stock units outstanding [Member]  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Stock Unit Awards Outstanding, Balance at June 30, 2017 158,596
Stock Unit Awards, Granted 300,071
Stock Unit Awards, Performance adjustment (68,003)
Stock Unit Awards, Forfeited (35,938)
Stock Unit Awards Outstanding, Balance at June 30, 2018 354,726
Aggregate Intrinsic Value, Balance at June 30, 2018 | $ $ 17.9
Weighted Average Grant Date Fair Value, Balance at June 30, 2017 | $ / shares $ 82.88
Weighted Average Grant Date Fair Value, Granted | $ / shares 53.02
Weighted Average Grant Date Fair Value, Forfeited | $ / shares 76.93
Weighted Average Grant Date Fair Value, Balance at June 30, 2018 | $ / shares $ 59.37