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Other Balance Sheet Information - Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Apr. 01, 2023
Dec. 26, 2020
Sep. 26, 2020
Apr. 01, 2023
Mar. 26, 2022
Sep. 24, 2022
Balance Sheet Related Disclosures [Abstract]            
Equipment $ 407.6     $ 407.6   $ 394.8
Equipment under customer usage agreements 506.8     506.8   486.5
Building and improvements 206.2     206.2   196.0
Leasehold improvements 47.1     47.1   44.8
Land 41.1     41.1   40.9
Furniture and fixtures 19.2     19.2   16.7
Finance Lease, Right-of-Use Asset, after Accumulated Amortization 8.4     8.4   7.5
Property, plant and equipment, gross 1,236.4     1,236.4   1,187.2
Less – accumulated depreciation and amortization (738.5)     (738.5)   (705.6)
Property, plant and equipment, net 497.9     497.9   $ 481.6
Grants received from Department of defense   $ 119.3 $ 7.6      
Proceeds received from government grants for capacity expansion $ 20.5     $ 20.5 $ 58.7