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Significant Accounting Policies - Narrative (Details)
shares in Thousands, $ in Thousands
12 Months Ended
Feb. 25, 2021
Mar. 16, 2020
USD ($)
Sep. 25, 2022
USD ($)
strategicBusinessUnit
Sep. 26, 2021
USD ($)
shares
Sep. 27, 2020
USD ($)
Noncontrolling Interest [Line Items]          
Increase (decrease) in operating revenue     $ 780,969 $ 794,649 $ 618,004
Payment of pension contributions     112 965 6,215
Decrease in pension, postretirement and postemployment benefit obligations     21,449 2,667 2,950
Inventory, LIFO reserve     $ 1,448 $ 988  
Number of strategic business units | strategicBusinessUnit     50    
Warrants outstanding (in shares) | shares       600  
Cash collateral for insurance     $ 4,600    
Reverse Stock Split          
Noncontrolling Interest [Line Items]          
Reverse stock split 0.1        
Minimum          
Noncontrolling Interest [Line Items]          
Vesting or restriction period (in years)     1 year    
Maximum          
Noncontrolling Interest [Line Items]          
Vesting or restriction period (in years)     4 years    
Leasehold improvements | Minimum          
Noncontrolling Interest [Line Items]          
Property and equipment, useful life (months)     3 years    
Leasehold improvements | Maximum          
Noncontrolling Interest [Line Items]          
Property and equipment, useful life (months)     10 years    
BHMG          
Noncontrolling Interest [Line Items]          
Combined purchase price   $ 140,000      
Subscription          
Noncontrolling Interest [Line Items]          
Increase (decrease) in operating revenue     $ 353,624 $ 357,713 268,285
Subscription | Reclassified Other Revenue to Subscription Revenue          
Noncontrolling Interest [Line Items]          
Increase (decrease) in operating revenue       828 2,346
Other          
Noncontrolling Interest [Line Items]          
Increase (decrease) in operating revenue     $ 60,917 67,653 60,064
Other | Reclassified Other Revenue to Subscription Revenue          
Noncontrolling Interest [Line Items]          
Increase (decrease) in operating revenue       $ (828) $ (2,346)
TNI Partners          
Noncontrolling Interest [Line Items]          
Noncontrolling interest, ownership percentage by parent     50.00%    
MNI          
Noncontrolling Interest [Line Items]          
Noncontrolling interest, ownership percentage by parent     50.00%    
BLOX Digital          
Noncontrolling Interest [Line Items]          
Noncontrolling interest, ownership percentage by parent     82.50%