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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, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue $ 357.6 $ 388.3 $ 686.0 $ 728.2
China [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue 144.1 138.2 275.3 315.0
Taiwan [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue 94.8 56.4 166.6 121.6
Japan [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue 88.3 149.5 191.4 212.7
Other [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue 22.0 20.5 38.0 37.0
South Korea [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue 6.5 21.6 11.5 38.0
United States [Member]        
Revenues from External Customers and Long-Lived Assets [Line Items]        
Net revenue $ 1.9 $ 2.1 $ 3.2 $ 3.9