Revenue Accounting for Contracts / Accounting for Joint Ventures (Pass-Through Costs Included in Revenues) (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
---|---|---|---|---|
Mar. 31, 2017 |
Apr. 01, 2016 |
Mar. 31, 2017 |
Apr. 01, 2016 |
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Revenue Accounting For Contracts Accounting For Joint Ventures [Abstract] | ||||
Pass-through costs included in revenues | $ 560,566 | $ 601,129 | $ 1,233,545 | $ 1,271,460 |