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Employee benefit plans (Details) (USD $)
0 Months Ended 12 Months Ended
Jan. 01, 2013
Mar. 01, 2014
Mar. 02, 2013
Feb. 25, 2012
401(k) Plan        
Number of months of service required to be completed by employees to be eligible to participate in plan   11 months    
Maximum contribution by participants (as a percent) 80.00%      
Maximum contribution by participants $ 17,500      
Percentage of employee contributions matched by the company   100.00% 50.00% 50.00%
Amount charged to expense for the company's matching contribution   2,570,000 997,000 769,000
Maximum
       
401(k) Plan        
Matching contribution by the company as a percentage of compensation   4.00% 4.00% 4.00%
Participants aged 50 years and over
       
401(k) Plan        
Maximum contribution by participants $ 23,000