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Restructuring and Divestiture Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) - Restructuring
$ in Millions
9 Months Ended
Jul. 01, 2017
USD ($)
Two Thousand Sixteen [Member]  
Restructuring Reserve [Roll Forward]  
Period beginning balance $ 6.3
Period end balance  
Two Thousand Sixteen [Member] | Fiscal 2017 Actions [Member]  
Restructuring Reserve [Roll Forward]  
Period beginning balance 0.0
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 10.8
Restructuring charges, gross 10.8
Restructuring Reserve [Roll Forward]  
Severance payments and adjustments (5.1)
Other payments (1.2)
Period end balance 10.8
Two Thousand Seventeen [Member] | Fiscal 2017 Actions [Member]  
Restructuring Cost and Reserve [Line Items]  
Restructuring Charges Under Exit Or Disposal Plan 5.8
Restructuring charges, gross 5.8
Restructuring Reserve [Roll Forward]  
Severance payments and adjustments 0.0
Other payments 0.0
Period end balance 5.8
Two Thousand Seventeen [Member] | Restructuring Action Two Thousand Sixteen [Domain]  
Restructuring Cost and Reserve [Line Items]  
Restructuring Charges Under Exit Or Disposal Plan 5.0
Restructuring charges, gross 5.0
Restructuring Reserve [Roll Forward]  
Severance payments and adjustments (4.9)
Other payments (1.0)
Period end balance 4.6
Two Thousand Seventeen [Member] | Fiscal 2015 Actions  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, gross 0.0
Restructuring Reserve [Roll Forward]  
Severance payments and adjustments (0.2)
Other payments 0.0
Period end balance 0.0
Two Thousand Seventeen [Member] | Fiscal 2014 Actions  
Restructuring Cost and Reserve [Line Items]  
Restructuring charges, gross 0.0
Restructuring Reserve [Roll Forward]  
Severance payments and adjustments 0.0
Other payments (0.2)
Period end balance $ 0.4