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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 6 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue $ 470.5 $ 463.7 $ 940.5 $ 746.5
Japan [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue 242.9 231.3 472.0 237.0
China [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue 128.0 126.3 233.8 274.5
United States [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue 47.0 37.5 113.0 78.3
South Korea [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue 37.2 32.0 88.2 78.8
Taiwan [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue 15.2 32.2 33.1 68.4
Other [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue $ 0.2 $ 4.4 $ 0.4 $ 9.5