Receivables - Additional Information (Details) - USD ($) $ in Thousands |
Jun. 26, 2015 |
Dec. 31, 2014 |
Sep. 27, 2014 |
|---|---|---|---|
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Estimated unbilled contract receivables not expected to be collected within the next 12 months | $ 3,600 | ||
| Exelis indemnified receivable obligation | 10,525 | $ 11,411 | |
| Other accrued liabilities | Indemnified Receivable | |||
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |||
| Exelis indemnified receivable obligation | $ 10,500 | $ 11,400 |