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Stock-Based Awards - Summary of PSUs and rTSRUs Activity Based on Targeted Number of Shares (Detail)
shares in Thousands
6 Months Ended
Mar. 31, 2019
$ / shares
shares
PSUs [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested, beginning balance | shares 70
Granted | shares 21
Vested | shares (36)
Cancelled | shares (9)
Unvested, ending balance | shares 46
Weighted Average Grant Date Fair Value, Unvested beginning balance | $ / shares $ 50.97
Weighted Average Grant Date Fair Value, Granted | $ / shares 67.13
Weighted Average Grant Date Fair Value, Vested | $ / shares 35.89
Weighted Average Grant Date Fair Value, Cancelled | $ / shares 35.89
Weighted Average Grant Date Fair Value, Unvested ending balance | $ / shares $ 73.03
rTSRUs [Member]  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Unvested, beginning balance | shares 70
Granted | shares 21
Vested | shares (45)
Unvested, ending balance | shares 46
Weighted Average Grant Date Fair Value, Unvested beginning balance | $ / shares $ 59.96
Weighted Average Grant Date Fair Value, Granted | $ / shares 47.42
Weighted Average Grant Date Fair Value, Vested | $ / shares 46.11
Weighted Average Grant Date Fair Value, Unvested ending balance | $ / shares $ 67.80