Revenue Recognition - Balance Sheet Impact of Adoption of ASC 606 (Details) - USD ($) $ in Thousands	Sep. 29, 2019	Oct. 01, 2018	Sep. 30, 2018
ASSETS
Accounts receivable – net	$ 768,720		$ 694,221
Contract assets	114,324		142,882
LIABILITIES AND EQUITY
Contract liabilities	165,611		143,270
Deferred income taxes	12,971		30,166
Equity:
Retained earnings	1,071,192		$ 944,965
Accounting Standards Update 2014-09
Equity:
Retained earnings		$ (2,800)
Recognition Under Previous Guidance
ASSETS
Accounts receivable – net	770,164
Contract assets	117,750
LIABILITIES AND EQUITY
Contract liabilities	168,321
Deferred income taxes	13,590
Equity:
Retained earnings	1,072,732
Impact of the Adoption of ASC 606 | Accounting Standards Update 2014-09
ASSETS
Accounts receivable – net	(1,444)
Contract assets	(3,426)	(5,000)
LIABILITIES AND EQUITY
Contract liabilities	(2,710)	(1,100)
Deferred income taxes	(619)
Equity:
Retained earnings	$ (1,540)	$ (2,800)