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Restructuring and Other Charges - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 27, 2019	Sep. 28, 2018	Sep. 29, 2017
Restructuring Cost and Reserve [Line Items]
Gain (loss) on sale of business and investments	$ 935,110	$ 0	$ 0
Other | CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Gain (loss) on sale of business and investments		$ 21,000
Other | Other Expense | CH2M HILL Companies, Ltd.
Restructuring Cost and Reserve [Line Items]
Litigation settlement, expense	$ 35,000

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