v2.4.0.8
Segment Information (Geographic Area Sales) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 29, 2013
Sep. 29, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 30, 2012
Sep. 30, 2012
Jul. 01, 2012
Apr. 01, 2012
Dec. 29, 2013
Dec. 30, 2012
Jan. 01, 2012
Segment Reporting Information [Line Items]                      
Revenue, Net $ 145,958 $ 98,925 $ 108,014 $ 97,111 $ 136,121 $ 89,830 $ 90,981 $ 83,103 $ 450,008 $ 400,035 $ 348,013
United States
                     
Segment Reporting Information [Line Items]                      
Revenue, Net                 376,820 337,648 292,148
United States | Engagement
                     
Segment Reporting Information [Line Items]                      
Revenue, Net                 255,832 226,578 186,243
United States | Non-engagement
                     
Segment Reporting Information [Line Items]                      
Revenue, Net                 120,988 111,070 105,905
Other countries
                     
Segment Reporting Information [Line Items]                      
Revenue, Net                 73,188 62,387 55,865
Other countries | Engagement
                     
Segment Reporting Information [Line Items]                      
Revenue, Net                 58,958 49,932 44,942
Other countries | Non-engagement
                     
Segment Reporting Information [Line Items]                      
Revenue, Net                 $ 14,230 $ 12,455 $ 10,923