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Segment Information and Geographic Area Information - Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
May. 02, 2015
Jan. 31, 2015
Nov. 01, 2014
Aug. 02, 2014
May. 03, 2014
Feb. 01, 2014
Oct. 26, 2013
Jul. 27, 2013
May. 02, 2015
May. 03, 2014
Apr. 27, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales $ 227.3 $ 206.0 $ 229.7 $ 218.1 $ 224.8 $ 189.8 $ 190.9 $ 167.3 $ 881.1 $ 772.8 $ 519.8
Property, plant and equipment 93.3       101.2       93.3 101.2 98.4
U.S.                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 564.6 456.6 242.9
Property, plant and equipment 42.7       43.8       42.7 43.8 45.1
China                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 112.6 97.4 88.2
Property, plant and equipment 9.0       6.6       9.0 6.6 7.4
Malta                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 153.5 186.4 157.4
Property, plant and equipment 28.0       37.5       28.0 37.5 32.5
Mexico                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Property, plant and equipment 5.8       7.3       5.8 7.3 9.0
Other                      
Revenues from External Customers and Long-Lived Assets [Line Items]                      
Net sales                 50.4 32.4 31.3
Property, plant and equipment $ 7.8       $ 6.0       $ 7.8 $ 6.0 $ 4.4