Other Accrued Liabilities (Schedule of Other Accrued Liabilities) (Details) - USD ($) $ in Thousands	Jun. 27, 2020	Sep. 28, 2019
Accounts Payable and Accrued Liabilities, Current [Abstract]
Contract reserves	$ 67,384	$ 60,914
Employee Benefits	40,480	37,040
Warranty Accrual	26,467	28,061
Accrued income taxes	14,660	26,532
Other	63,070	36,178
Other accrued liabilities	$ 212,061	$ 188,725