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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% |  |

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