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Pension and Other Postretirement Benefit Plans - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Jul. 02, 2021	Jun. 26, 2020	Mar. 27, 2020	Jul. 02, 2021	Jun. 26, 2020	Mar. 02, 2021
Defined Benefit Plan Disclosure [Line Items]
Settlement loss	$ 0	$ 0		$ 0	$ 2,651
PA Consulting Group Limited
Defined Benefit Plan Disclosure [Line Items]
Percentage of outstanding shares of common and preferred stock acquired						65.00%
CH2M Hill and OMI Retiree Medical Plans
Defined Benefit Plan Disclosure [Line Items]
Settlement loss			$ 2,700

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Percentage of voting equity interests acquired at the acquisition date in the business combination.

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-Publisher FASB
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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
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