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Restructuring and Divestiture Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) - Restructuring
$ in Millions
 3 Months Ended
Dec. 31, 2016
USD ($)
Two Thousand Sixteen [Member]  
Restructuring Reserve [Roll Forward]  
Period beginning balance $ 6.3
Period end balance  
Two Thousand Sixteen [Member] | Restructuring Action Two Thousand Sixteen [Domain]  
Restructuring Reserve [Roll Forward]  
Period beginning balance 5.5
Period end balance  
Two Thousand Sixteen [Member] | Fiscal 2015 Actions  
Restructuring Reserve [Roll Forward]  
Period beginning balance 0.2
Period end balance  
Two Thousand Sixteen [Member] | Fiscal 2014 Actions  
Restructuring Reserve [Roll Forward]  
Period beginning balance 0.6
Period end balance  
Two Thousand Seventeen [Member]  
Restructuring Cost and Reserve [Line Items]  
Restructuring Charges Under Exit Or Disposal Plan 3.2
Facility Closure Costs 3.5
Restructuring Reserve [Roll Forward]  
Severance payments and adjustments (3.9)
Other payments (0.5)
Period end balance 5.4
Two Thousand Seventeen [Member] | Restructuring Action Two Thousand Sixteen [Domain]  
Restructuring Cost and Reserve [Line Items]  
Restructuring Charges Under Exit Or Disposal Plan 3.2
Facility Closure Costs 3.5
Restructuring Reserve [Roll Forward]  
Severance payments and adjustments (3.8)
Other payments (0.4)
Period end balance 4.8
Two Thousand Seventeen [Member] | Fiscal 2015 Actions  
Restructuring Cost and Reserve [Line Items]  
Facility Closure Costs 0.0
Restructuring Reserve [Roll Forward]  
Severance payments and adjustments (0.1)
Other payments 0.0
Period end balance 0.1
Two Thousand Seventeen [Member] | Fiscal 2014 Actions  
Restructuring Cost and Reserve [Line Items]  
Facility Closure Costs 0.0
Restructuring Reserve [Roll Forward]  
Severance payments and adjustments 0.0
Other payments (0.1)
Period end balance $ 0.5