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Restructuring Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) - Restructuring
$ in Millions
 6 Months Ended
Mar. 31, 2018
USD ($)
Two Thousand Seventeen [Member]  
Restructuring Reserve [Roll Forward]  
Period beginning balance $ 11.5
Two Thousand Seventeen [Member] | Fiscal 2018 Action [Member]  
Restructuring Reserve [Roll Forward]  
Period beginning balance 0.0
Two Thousand Seventeen [Member] | Fiscal 2017 Actions [Member]  
Restructuring Reserve [Roll Forward]  
Period beginning balance 7.5
Two Thousand Seventeen [Member] | Fiscal 2016 Actions  
Restructuring Reserve [Roll Forward]  
Period beginning balance 3.7
Two Thousand Seventeen [Member] | Other Restructuring [Member]  
Restructuring Reserve [Roll Forward]  
Period beginning balance 0.3
Two thousand eighteen [Member]  
Restructuring Reserve [Roll Forward]  
Fiscal 2018 charges 5.6
Stock-based compensation (1.3)
Severance payments and adjustments (7.8)
Other payments (0.8)
Period end balance 7.2
Two thousand eighteen [Member] | Fiscal 2018 Action [Member]  
Restructuring Reserve [Roll Forward]  
Fiscal 2018 charges 5.6
Stock-based compensation (1.3)
Severance payments and adjustments (3.0)
Other payments 0.0
Period end balance 1.3
Two thousand eighteen [Member] | Fiscal 2017 Actions [Member]  
Restructuring Reserve [Roll Forward]  
Fiscal 2018 charges 0.0
Stock-based compensation 0.0
Severance payments and adjustments (4.6)
Other payments 0.0
Period end balance 2.9
Two thousand eighteen [Member] | Fiscal 2016 Actions  
Restructuring Reserve [Roll Forward]  
Fiscal 2018 charges 0.0
Stock-based compensation 0.0
Severance payments and adjustments (0.2)
Other payments (0.6)
Period end balance 2.9
Two thousand eighteen [Member] | Other Restructuring [Member]  
Restructuring Reserve [Roll Forward]  
Fiscal 2018 charges 0.0
Stock-based compensation 0.0
Severance payments and adjustments 0.0
Other payments (0.2)
Period end balance $ 0.1