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Fair Value Hierarchy of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
6 Months Ended
Aug. 23, 2019
May 24, 2019
Feb. 22, 2019
Aug. 24, 2018
Feb. 23, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Document Period End Date Aug. 23, 2019        
Long-term Debt, Fair Value $ 544.0   $ 492.0    
Cash and cash equivalents 229.1   261.3    
Assets, Fair Value Disclosure [Abstract]          
Restricted Cash 4.8   3.5 $ 3.5 $ 2.5
Assets, Fair Value Disclosure   $ 237.6 272.6    
Liabilities, Fair Value Disclosure [Abstract]          
Foreign exchange forward contracts, Liability, Fair Value Disclosure (0.4)   (0.5)    
Liabilities, Fair Value Disclosure (0.4)   (0.5)    
Foreign Exchange Contract [Member]          
Assets, Fair Value Disclosure [Abstract]          
Foreign Currency Contract, Asset, Fair Value Disclosure 1.7   3.9    
Auction Rate Securities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Available-for-sale Securities, Fair Value Disclosure 2.0   3.9    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Cash and cash equivalents 229.1   261.3    
Assets, Fair Value Disclosure [Abstract]          
Restricted Cash 4.8   3.5    
Assets, Fair Value Disclosure 233.9   264.8    
Liabilities, Fair Value Disclosure [Abstract]          
Foreign exchange forward contracts, Liability, Fair Value Disclosure 0.0   0.0    
Liabilities, Fair Value Disclosure 0.0   0.0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member]          
Assets, Fair Value Disclosure [Abstract]          
Foreign Currency Contract, Asset, Fair Value Disclosure 0.0   0.0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Auction Rate Securities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Available-for-sale Securities, Fair Value Disclosure 0.0   0.0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Cash and cash equivalents 0.0   0.0    
Assets, Fair Value Disclosure [Abstract]          
Restricted Cash 0.0   0.0    
Assets, Fair Value Disclosure 1.7   3.9    
Liabilities, Fair Value Disclosure [Abstract]          
Foreign exchange forward contracts, Liability, Fair Value Disclosure (0.4)   (0.5)    
Liabilities, Fair Value Disclosure (0.4)   (0.5)    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member]          
Assets, Fair Value Disclosure [Abstract]          
Foreign Currency Contract, Asset, Fair Value Disclosure 1.7   3.9    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Auction Rate Securities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Available-for-sale Securities, Fair Value Disclosure 0.0   0.0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Cash and cash equivalents 0.0   0.0    
Assets, Fair Value Disclosure [Abstract]          
Restricted Cash 0.0   0.0    
Assets, Fair Value Disclosure 2.0   3.9    
Liabilities, Fair Value Disclosure [Abstract]          
Foreign exchange forward contracts, Liability, Fair Value Disclosure 0.0   0.0    
Liabilities, Fair Value Disclosure 0.0   0.0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Contract [Member]          
Assets, Fair Value Disclosure [Abstract]          
Foreign Currency Contract, Asset, Fair Value Disclosure 0.0   0.0    
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Auction Rate Securities [Member]          
Assets, Fair Value Disclosure [Abstract]          
Available-for-sale Securities, Fair Value Disclosure $ 2.0   $ 3.9