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Segment, Customers, and Geographic Information (Tables) | 6 Months Ended
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Dec. 31, 2019
Segment Reporting Information [Line Items] |
Net Revenue within Geographic Areas Based on Customers' Locations | Net revenue within geographic areas based on our customers’ locations for the periods presented was as follows (in millions):
|  | Three Months Ended |  |  | Six Months Ended |
|  | December 31, |  |  | December 31, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
China |  | $ | 138.2 |  |  | $ | 251.7 |  |  | $ | 315.0 |  |  | $ | 479.5 |
Japan |  |  | 149.5 |  |  |  | 78.0 |  |  |  | 212.7 |  |  |  | 146.5 |
Taiwan |  |  | 56.4 |  |  |  | 61.0 |  |  |  | 121.6 |  |  |  | 137.4 |
South Korea |  |  | 21.6 |  |  |  | 11.7 |  |  |  | 38.0 |  |  |  | 31.8 |
Other |  |  | 20.5 |  |  |  | 13.9 |  |  |  | 37.0 |  |  |  | 29.3 |
United States |  |  | 2.1 |  |  |  | 9.2 |  |  |  | 3.9 |  |  |  | 18.6 |
|  | $ | 388.3 |  |  | $ | 425.5 |  |  | $ | 728.2 |  |  | $ | 843.1 |
Net Revenue from External Customers | Net revenue from our customers for each group of similar products was as follows (in millions):
|  | Three Months Ended |  |  | Six Months Ended |
|  | December 31, |  |  | December 31, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Mobile product applications |  | $ | 217.7 |  |  | $ | 274.4 |  |  | $ | 402.0 |  |  | $ | 537.1 |
PC product applications |  |  | 81.6 |  |  |  | 63.9 |  |  |  | 149.4 |  |  |  | 132.5 |
IoT product applications |  |  | 89.0 |  |  |  | 87.2 |  |  |  | 176.8 |  |  |  | 173.5 |
|  | $ | 388.3 |  |  | $ | 425.5 |  |  | $ | 728.2 |  |  | $ | 843.1 |
Sales Revenue, Net [Member] |
Segment Reporting Information [Line Items] |
Major Customers as Percentage of Net Revenue | Net revenue from major customers as a percentage of total net revenue for the periods presented was as follows:
|  | Three Months Ended |  |  | Six Months Ended |
|  | December 31, |  |  | December 31, |
|  | 2019 |  |  | 2018 |  |  | 2019 |  |  | 2018 |
Customer A |  | 21% |  |  | * |  |  | 15% |  |  | * |
Customer B |  | 13% |  |  | * |  |  | 11% |  |  | * |
Customer C |  | * |  |  | 20% |  |  | * |  |  | 19% |
Customer D |  | * |  |  | 14% |  |  | * |  |  | 12% |
* | Less than 10%
Accounts Receivable [Member] |
Segment Reporting Information [Line Items] |
Major Customers as Percentage of Net Revenue | Major customer accounts receivable as a percentage of total accounts receivable were as follows:
|  | December 31, |  |  | June 30, |
|  | 2019 |  |  | 2019 |
Customer A |  | 21% |  |  | * |
Customer B |  | 16% |  |  | * |
Customer C |  | 11% |  |  | 25% |
Customer D |  | * |  |  | 16% |
* | Less than 10%

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