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Other Balance Sheet Information - Property, Plant and Equipment (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2022
Dec. 25, 2021
Sep. 25, 2021
Sep. 24, 2022
Balance Sheet Related Disclosures [Abstract]        
Equipment $ 396.3     $ 394.8
Equipment under customer usage agreements 506.0     486.5
Building and improvements 206.1     196.0
Leasehold improvements 46.7     44.8
Land 41.1     40.9
Furniture and fixtures 18.0     16.7
Finance Lease, Right-of-Use Asset, after Accumulated Amortization 8.3     7.5
Property, plant and equipment, gross 1,222.5     1,187.2
Less – accumulated depreciation and amortization (728.2)     (705.6)
Property, plant and equipment, net 494.3     481.6
Grants received from Department of defense   $ 119.3 $ 7.6  
Grants Receivable, Current 20.5      
Department of defense funds received $ 0.0 $ 21.3   75.0
Department of Defense funds received, not capitalized       $ 7.6