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Financial instruments (Details)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 30, 2011
USD ($)
Dec. 30, 2011
EUR (€)
Dec. 31, 2010
USD ($)
Dec. 31, 2010
EUR (€)
Dec. 30, 2011
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
USD ($)
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
USD ($)
Dec. 30, 2011
Fair Value, Measurements, Recurring [Member]
Quoted Prices In Active markets for Identical Assets (Level 1) [Member]
USD ($)
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Quoted Prices In Active markets for Identical Assets (Level 1) [Member]
USD ($)
Dec. 30, 2011
Fair Value, Measurements, Recurring [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Significant Other Observable Inputs (Level 2) [Member]
USD ($)
Dec. 30, 2011
Fair Value, Measurements, Recurring [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Dec. 31, 2010
Fair Value, Measurements, Recurring [Member]
Significant Unobservable Inputs (Level 3) [Member]
USD ($)
Dec. 30, 2011
Foreign Exchange Forward [Member]
Other income (expense), net [Member]
USD ($)
Dec. 31, 2010
Foreign Exchange Forward [Member]
Other income (expense), net [Member]
USD ($)
Dec. 30, 2011
Foreign Exchange Forward [Member]
Not Designated as Hedging Instrument [Member]
Prepaid expenses and other current assets [Member]
USD ($)
Dec. 31, 2010
Foreign Exchange Forward [Member]
Not Designated as Hedging Instrument [Member]
Prepaid expenses and other current assets [Member]
USD ($)
Dec. 30, 2011
Foreign Exchange Forward [Member]
Not Designated as Hedging Instrument [Member]
Accrued expenses and other current liabilities [Member]
USD ($)
Dec. 31, 2010
Foreign Exchange Forward [Member]
Not Designated as Hedging Instrument [Member]
Accrued expenses and other current liabilities [Member]
USD ($)
Financial instruments [Abstract]                                    
Foreign exchange forward contracts outstanding to sell forward $ 3.9 € 3.0 $ 7.4 € 5.5                            
Derivatives, Fair Value [Line Items]                                    
Foreign exchange forward contracts, prepaid expenses and other current assets         (0.2) [1]   0 [1]   (0.2) [1]   0 [1]       0.2 0    
Foreign exchange forward contracts, accrued expenses and other current liabilities                             (0.2)   0 (0.5)
Total                             (0.2)   0 (0.5)
Derivative Instruments, Gain (Loss) [Line Items]                                    
Derivative instrument, realized and unrealized gains (losses)                         (0.1) 0.6        
Total                         (0.1) 0.6        
Estimated fair value of the outstanding borrowings under senior revolving credit facility 45.9                                  
Estimated fair value of the convertible senior notes 40.0                                  
Assets                                    
Other         0.2 [1]   0 [1]   0.2 [1]   0 [1]       (0.2) 0    
Total         0.2   0   0.2   0              
Liabilities                                    
Other           (0.5) [1]   0 [1]   (0.5) [1]   0 [1]            
Total           $ (0.5)   $ 0   $ (0.5)   $ 0            
[1] Amounts include forward contracts outstanding in our Consolidated Balance Sheets