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Leases - Cash Flow Information (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 27, 2020
Dec. 29, 2019
Dec. 27, 2020
Dec. 29, 2019
Lessee, Lease, Description [Line Items]        
Cash paid for interest portion of financing leases     $ 0.1 $ 0.0
Cash used in operating activities:        
Cash paid for operating leases     2.7 2.6
Cash paid for interest portion of financing leases $ 0.1 $ 0.1 0.2  
Cash used in financing activities:        
Cash paid for principal portion of finance leases     0.2 0.1
Non-cash activities:        
Operating lease additions due to adoption of ASC 842     0.0 11.0
Operating lease additions and modifications, net     1.4 4.8
Finance lease additions     0.0 3.3
Transfer of finance lease liability to accounts payable and accrued expenses (2)     $ 4.2 0.0
Maximum        
Lessee, Lease, Description [Line Items]        
Cash paid for interest portion of financing leases       $ 0.1