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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
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