Other Accrued Liabilities (Schedule of Other Accrued Liabilities) (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Sep. 30, 2018	Sep. 29, 2018
Accrued Liabilities, Current [Abstract]
Contract reserves	$ 60,914		$ 48,818
Employee benefits	37,040		38,538
Warranty accrual	28,061		25,537
Accrued income taxes	26,532		16,737
Other	36,178		40,132
Other accrued liabilities	$ 188,725	$ 173,331	$ 169,762