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Fair Value Hierarchy of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
9 Months Ended
Nov. 22, 2019
Feb. 22, 2019
Nov. 23, 2018
Feb. 23, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Document Period End Date Nov. 22, 2019      
Long-term Debt, Fair Value $ 540.0 $ 492.0    
Cash and cash equivalents 367.7 261.3    
Assets, Fair Value Disclosure [Abstract]        
Restricted Cash 4.9 3.5 $ 3.4 $ 2.5
Assets, Fair Value Disclosure 375.9 272.6    
Liabilities, Fair Value Disclosure [Abstract]        
Foreign exchange forward contracts, Liability, Fair Value Disclosure (0.3) (0.5)    
Liabilities, Fair Value Disclosure (0.3) (0.5)    
Foreign Exchange Contract [Member]        
Assets, Fair Value Disclosure [Abstract]        
Foreign Currency Contract, Asset, Fair Value Disclosure 1.3 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 367.7 261.3    
Assets, Fair Value Disclosure [Abstract]        
Restricted Cash 4.9 3.5    
Assets, Fair Value Disclosure 372.6 264.8    
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 1.3 3.9    
Liabilities, Fair Value Disclosure [Abstract]        
Foreign exchange forward contracts, Liability, Fair Value Disclosure (0.3) (0.5)    
Liabilities, Fair Value Disclosure (0.3) (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 1.3 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