Joint Ventures and VIE's (Narrative) (Details) - USD ($) $ in Thousands	Oct. 02, 2020	Sep. 27, 2019	Sep. 28, 2018
Variable Interest Entity [Line Items]
VIE unconsolidated assets	$ 12,354,353	$ 11,462,711
Equity method investments exceeds its share of venture net assets	71,100
AWE ML
Variable Interest Entity [Line Items]
Investment in equity securities	$ 38,000
Ownership percentage	24.50%
Unconsolidated Joint Venture | VIE, not primary beneficiary
Variable Interest Entity [Line Items]
VIE unconsolidated assets	$ 64,100	61,100
VIE unconsolidated liabilities	63,000	63,700
Investment in equity securities	161,300	157,900
Unconsolidated Joint Venture | VIE, not primary beneficiary
Variable Interest Entity [Line Items]
VIE unconsolidated assets	1,731,900	1,473,400
VIE unconsolidated liabilities	1,520,700	1,165,700
Equity method investments exceeds its share of venture net assets	82,200	48,500	$ 47,900
Accounts receivable from unconsolidated joint venture	$ 8,300	$ 19,500