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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, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue $ 388.3 $ 425.5 $ 728.2 $ 843.1
China [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue 138.2 251.7 315.0 479.5
Japan [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue 149.5 78.0 212.7 146.5
Taiwan [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue 56.4 61.0 121.6 137.4
South Korea [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue 21.6 11.7 38.0 31.8
Other [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue 20.5 13.9 37.0 29.3
United States [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue $ 2.1 $ 9.2 $ 3.9 $ 18.6