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Segment, Customers, and Geographic Information - Net Revenue from External Customers (Detail) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2015
 [1]
Sep. 30, 2014
Revenue from External Customer [Line Items]    
Net revenue $ 470.0 [2] $ 282.8
Mobile Product Applications [Member]    
Revenue from External Customer [Line Items]    
Net revenue 412.1 199.8
PC Product Applications [Member]    
Revenue from External Customer [Line Items]    
Net revenue $ 57.9 $ 83.0
[1] Includes the post-acquisition results of operations of RSP, acquired October 1, 2014.
[2] Includes the post-acquisition results of operations of Renesas SP Drivers, Inc., or RSP, acquired October 1, 2014.