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Restructuring Activities - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Sep. 26, 2015
Jun. 30, 2018
Jun. 24, 2017
Jun. 25, 2016
Restructuring And Related Activities [Abstract]        
Restructuring costs $ 1.9 $ 12.0 $ 7.3 $ 8.6