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Acquisition (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Mar. 28, 2014
Sep. 26, 2014
Minimum [Member]
Sep. 26, 2014
Maximum [Member]
Assets acquired and liabilities assumed $ 2.9    
Purchase price, common stock 1.0    
Vesting pervision 4 years    
Contingent consideration 8.0    
Purchase price 7.6    
Acquired intangible assets $ 4.1    
Amortization period   2 years 5 years