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Revenue and Contract Balances - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 28, 2020 | Jun. 30, 2019 | Sep. 29, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Contract liability revenue recognized during the period |  | $ 106,000 | $ 84,000 |
Favorable (unfavorable) operating income adjustments | $ 8,200 | (2,800) | 5,000 |
Liabilities for anticipated losses |  | 19,500 |  | $ 11,500
Estimated cost to complete the related contracts |  | $ 96,000 |  |
Period for billing and collecting unbilled receivables |  | 12 months |  |
Unbilled accounts receivable related to claims and requests for equitable adjustment on contracts |  | $ 14,000 |  | $ 15,000
Remaining unsatisfied performance obligation |  | $ 3,049,933 |  |
Remaining performance obligation, termination notice period one |  | 30 days |  |
Remaining performance obligation, termination notice period two |  | 60 days |  |
Remaining performance obligation, termination notice period three |  | 90 days |  |
RCM |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Recognized reduction of revenue |  |  | 4,800 |
Losses from claim settlement |  |  | 5,900 |
CIG |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Recognized reduction of revenue |  |  | 4,200 |
Losses from claim settlement |  | $ 4,400 | $ 4,200 |

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