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Restructuring Charges - Charges Taken Related to Accrued Restructuring Actions (Detail) - USD ($)
$ in Millions
 12 Months Ended
Sep. 30, 2023
Sep. 24, 2022
Sep. 25, 2021
Restructuring Reserve [Roll Forward]      
Fiscal restructuring charges     $ 8.7
Fiscal 2021 restructuring charges | Restructuring Charges      
Restructuring Reserve [Roll Forward]      
Balance     4.5
Fiscal restructuring charges     9.3
Stock-based compensation     (0.9)
Severance payments and adjustments     (8.8)
Fiscal 2021 restructuring charges | Fiscal 2023 Actions | Restructuring Charges      
Restructuring Reserve [Roll Forward]      
Balance     0.0
Fiscal restructuring charges     0.0
Stock-based compensation     0.0
Severance payments and adjustments     0.0
Fiscal 2021 restructuring charges | Fiscal 2022 Actions | Restructuring Charges      
Restructuring Reserve [Roll Forward]      
Balance     0.0
Fiscal restructuring charges     0.0
Stock-based compensation     0.0
Severance payments and adjustments     0.0
Fiscal 2021 restructuring charges | Fiscal 2021 Actions | Restructuring Charges      
Restructuring Reserve [Roll Forward]      
Balance     0.0
Fiscal restructuring charges     8.7
Stock-based compensation     (0.9)
Severance payments and adjustments     (4.6)
Fiscal 2021 restructuring charges | Previous Other Charges | Restructuring Charges      
Restructuring Reserve [Roll Forward]      
Balance     4.5
Fiscal restructuring charges     0.6
Stock-based compensation     0.0
Severance payments and adjustments     (4.2)
Fiscal 2022 restructuring charges | Restructuring Charges      
Restructuring Reserve [Roll Forward]      
Balance $ 3.1 $ 4.1  
Fiscal restructuring charges   2.4  
Severance payments and adjustments   (3.4)  
Balance   3.1 4.1
Fiscal 2022 restructuring charges | Fiscal 2023 Actions | Restructuring Charges      
Restructuring Reserve [Roll Forward]      
Balance 0.0 0.0  
Fiscal restructuring charges   0.0  
Severance payments and adjustments   0.0  
Balance   0.0 0.0
Fiscal 2022 restructuring charges | Fiscal 2022 Actions | Restructuring Charges      
Restructuring Reserve [Roll Forward]      
Balance 2.7 0.0  
Fiscal restructuring charges   3.1  
Severance payments and adjustments   (0.4)  
Balance   2.7 0.0
Fiscal 2022 restructuring charges | Fiscal 2021 Actions | Restructuring Charges      
Restructuring Reserve [Roll Forward]      
Balance 0.4 3.2  
Fiscal restructuring charges   (0.3)  
Severance payments and adjustments   (2.5)  
Balance   0.4 3.2
Fiscal 2022 restructuring charges | Previous Other Charges | Restructuring Charges      
Restructuring Reserve [Roll Forward]      
Balance 0.0 0.9  
Fiscal restructuring charges   (0.4)  
Severance payments and adjustments   (0.5)  
Balance   $ 0.0 $ 0.9
Fiscal 2023 restructuring charges | Restructuring Charges      
Restructuring Reserve [Roll Forward]      
Fiscal restructuring charges 12.0    
Severance payments and adjustments (6.1)    
Balance 9.0    
Fiscal 2023 restructuring charges | Fiscal 2023 Actions | Restructuring Charges      
Restructuring Reserve [Roll Forward]      
Fiscal restructuring charges 5.5    
Severance payments and adjustments (3.2)    
Balance 2.3    
Fiscal 2023 restructuring charges | Fiscal 2022 Actions | Restructuring Charges      
Restructuring Reserve [Roll Forward]      
Fiscal restructuring charges 6.5    
Severance payments and adjustments (2.5)    
Balance 6.7    
Fiscal 2023 restructuring charges | Fiscal 2021 Actions | Restructuring Charges      
Restructuring Reserve [Roll Forward]      
Fiscal restructuring charges 0.0    
Severance payments and adjustments (0.4)    
Balance 0.0    
Fiscal 2023 restructuring charges | Previous Other Charges | Restructuring Charges      
Restructuring Reserve [Roll Forward]      
Fiscal restructuring charges 0.0    
Severance payments and adjustments 0.0    
Balance $ 0.0