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Leases - Cash Flow Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 27, 2021
Jun. 28, 2020
Jun. 30, 2019
Cash used in operating activities:      
Cash paid for operating leases $ 5.7 $ 5.5  
Cash paid for interest portion of financing leases 0.3 0.1  
Cash used in financing activities:      
Cash paid for principal portion of finance leases 0.4 0.8  
Non-cash operating activities:      
Operating lease additions due to adoption of ASC 842 0.0 11.0  
Operating lease additions and modifications, net 4.8 6.4  
Finance lease additions 4.8 15.7  
Transfer of finance lease liability to accounts payable and accrued expenses $ 4.2 $ 0.0 $ 0.0