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Accounts Receivable - Net (Details) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 27, 2015 USD ($) | Mar. 29, 2015 USD ($) | Mar. 27, 2016 USD ($) item | Mar. 29, 2015 USD ($) | Sep. 27, 2015 USD ($)
Account receivable major customer |  |  |  |  |
Threshold percentage for disclosure of accounts receivable from a single client |  |  | 10.00% |  | 10.00%
Accounts Receivable, Net |  |  |  |  |
Billed |  |  | $ 348,360 |  | $ 331,364
Unbilled |  |  | 342,828 |  | 311,823
Contract retentions |  |  | 28,695 |  | 24,333
Total accounts receivable - gross |  |  | 719,883 |  | 667,520
Allowance for doubtful accounts |  |  | (38,760) |  | (31,490)
Total accounts receivable - net |  |  | 681,123 |  | 636,030
Billings in excess of costs on uncompleted contracts |  |  | $ 92,125 |  | 93,989
Period for billing and collecting unbilled receivables |  |  | 12 months |  |
Period for earning majority of billings in excess of costs |  |  | 12 months |  |
Total accounts receivable related to claims and requests for equitable adjustment on contracts |  |  | $ 42,000 |  | 53,000
Gain from claim settlement |  |  |  | $ 200 |
Revenue recognized related to the evaluation of claim amounts |  | $ (3,000) |  |  |
Decrease in operating income related to the evaluation of claim amounts |  | 3,000 |  |  |
Billed accounts receivable related to U.S. federal government contracts |  |  | 56,800 |  | 61,900
U.S. federal government unbilled receivables |  |  | 76,000 |  | 74,200
Revenue Recognition and Contract Costs |  |  |  |  |
Net unfavorable operating income adjustments |  | $ 3,500 |  | $ 5,900 |
Liability for anticipated losses |  |  | 7,900 |  | $ 10,500
Estimated cost to complete the related contracts |  |  | $ 36,700 |  |
Accounts Receivable | International |  |  |  |  |
Account receivable major customer |  |  |  |  |
Number of clients exceeding threshold | item |  |  | 1 |  |
RCM |  |  |  |  |
Accounts Receivable, Net |  |  |  |  |
Cash proceeds from claim settlement | $ 13,400 |  | $ 13,400 |  |
Claims amount | 8,800 |  | 8,800 |  |
Gain from claim settlement | 4,600 |  | 4,600 |  |
Decrease in operating income related to the increase in allowance for doubtful accounts | 7,900 |  | 7,900 |  |
Increase in allowance for doubtful accounts | 7,900 |  | 7,900 |  |
Collectability of certain accounts receivable | $ 4,600 |  | $ 4,600 |  |

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