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Restructuring and Other Charges - Schedule of Restructuring and Other Activities (Details)
$ in Thousands
3 Months Ended
Dec. 29, 2017
USD ($)
Restructuring And Related Activities [Abstract]  
Balance at September 29, 2017 $ 174,343
CH2M Charges 19,349
Payments (34,226)
Balance at December 29, 2017 $ 159,466