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Supplemental Cash Flow Information - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2018
Sep. 24, 2017
Jun. 24, 2018
Jun. 25, 2017
Supplemental Cash Flow Information [Abstract]        
Capital expenditures incurred but not yet paid $ 1,607 $ 2,928 $ 3,187 $ 3,234