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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, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue $ 425.5 $ 430.4 $ 843.1 $ 847.8
China [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue 251.7 209.9 479.5 419.7
Taiwan [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue 61.0 60.2 137.4 103.3
Japan [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue 78.0 97.3 146.5 188.3
South Korea [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue 11.7 12.5 31.8 33.7
Other [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue 13.9 21.7 29.3 37.8
United States [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue $ 9.2 $ 28.8 $ 18.6 $ 65.0