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Summary of Significant Accounting Policies Warranty roll-forward (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 26, 2021
Feb. 28, 2020
Feb. 22, 2019
Feb. 23, 2018
Accounting Policies [Abstract]        
Standard and Extended Product Warranty Accrual $ 22.5 $ 26.7 $ 31.0 $ 36.8
Standard and Extended Product Warranty Accrual, Increase for Warranties Issued 2.8 8.1 6.1  
Standard and Extended Product Warranty Accrual, Period Increase (Decrease) (4.9) 0.0 0.0  
Standard and Extended Product Warranty Accrual, Decrease for Payments 2.4 12.3 11.6  
Standard and Extended Product Warranty Accrual, Foreign Currency Translation Gain (Loss) $ 0.3 $ (0.1) $ (0.3)