Other Financial Information (Components of Accrued Liabilities) (Details) - USD ($) $ in Thousands	Sep. 30, 2016	Oct. 02, 2015
Other Financial Information [Abstract]
Accrued payroll and related liabilities	$ 561,652	$ 623,297
Project-related accruals	102,400	130,401
Non project-related accruals	87,813	102,324
Insurance liabilities	54,984	59,081
Sales and other similar taxes	37,029	53,476
Deferred rent	69,059	93,040
Other	25,441	29,366
Total	$ 938,378	$ 1,090,985