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Segment, Customers, and Geographic Information - Net Revenue within Geographic Areas Based on Customers' Locations (Detail) - USD ($)
$ in Millions
 3 Months Ended
Sep. 30, 2015
 [2]
Sep. 30, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net revenue $ 470.0 [1] $ 282.8
Japan [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net revenue 229.1 5.7
China [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net revenue 105.8 148.2
United States [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net revenue 66.0 40.8
South Korea [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net revenue 51.0 46.8
Taiwan [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net revenue 17.9 36.2
Other [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Net revenue $ 0.2 $ 5.1
[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.