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Revenue from Contracts with Customers (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 25, 2020 | Mar. 27, 2020
Revenue from Contract with Customer [Abstract] |  |
Net Sales by Core End Market and Application | Net sales by core end market and application:
|  | Three-Month Period Ended |  |  | Nine-Month Period Ended |
|  | December 25, 2020 |  |  | December 27, 2019 |  |  | December 25, 2020 |  |  | December 27, 2019 |
Core end market: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Automotive |  | $ | 113,902 |  |  | $ | 99,074 |  |  | $ | 279,759 |  |  | $ | 289,681 |
Industrial |  |  | 23,654 |  |  |  | 21,358 |  |  |  | 65,710 |  |  |  | 56,095 |
Other |  |  | 26,893 |  |  |  | 15,070 |  |  |  | 70,630 |  |  |  | 53,399 |
Other applications: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Wafer foundry products |  |  | — |  |  |  | 16,634 |  |  |  | — |  |  |  | 49,622 |
Distribution of Sanken products |  |  | — |  |  |  | 7,666 |  |  |  | — |  |  |  | 26,688 |
Total net sales |  | $ | 164,449 |  |  | $ | 159,802 |  |  | $ | 416,099 |  |  | $ | 475,485 |
| Net sales by core end market and application:
|  | Fiscal Year Ended March 27, 2020 |
Core end market: |  |  |  |
Automotive |  | $ | 395,277 |
Industrial |  |  | 78,399 |
Other |  |  | 68,622 |
Other applications: |  |  |  |
Wafer foundry products |  |  | 72,370 |
Distribution of Sanken products |  |  | 35,421 |
Total net sales |  | $ | 650,089 |
Revenue from External Customers by Products and Services | Net sales by product:
|  | Three-Month Period Ended |  |  | Nine-Month Period Ended |
|  | December 25, 2020 |  |  | December 27, 2019 |  |  | December 25, 2020 |  |  | December 27, 2019 |
Power integrated circuits (“PIC”) |  | $ | 54,406 |  |  | $ | 43,665 |  |  | $ | 146,276 |  |  | $ | 123,900 |
Magnetic sensors (“MS”) |  |  | 109,457 |  |  |  | 91,837 |  |  |  | 268,956 |  |  |  | 275,275 |
Photonics |  |  | 586 |  |  |  | — |  |  |  | 867 |  |  |  | — |
Wafer foundry products |  |  | — |  |  |  | 16,634 |  |  |  | — |  |  |  | 49,622 |
Distribution of Sanken products |  |  | — |  |  |  | 7,666 |  |  |  | — |  |  |  | 26,688 |
Total net sales |  | $ | 164,449 |  |  | $ | 159,802 |  |  | $ | 416,099 |  |  | $ | 475,485 |
| Net sales by product:
|  | Fiscal Year Ended March 27, 2020 |
Power integrated circuits (‘PIC”) |  | $ | 165,911 |
Magnetic sensors (“MS”) |  |  | 376,387 |
Wafer foundry products |  |  | 72,370 |
Distribution of Sanken products |  |  | 35,421 |
Total net sales |  | $ | 650,089 |
Revenue from External Customers by Geographic Areas | Net sales by geography:
|  | Three-Month Period Ended |  |  | Nine-Month Period Ended |
|  | December 25, 2020 |  |  | December 27, 2019 |  |  | December 25, 2020 |  |  | December 27, 2019 |
Americas: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States |  | $ | 23,934 |  |  | $ | 27,498 |  |  | $ | 57,892 |  |  | $ | 86,746 |
Other Americas |  |  | 5,620 |  |  |  | 4,722 |  |  |  | 10,797 |  |  |  | 15,930 |
EMEA: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Europe |  |  | 28,239 |  |  |  | 24,341 |  |  |  | 70,459 |  |  |  | 76,622 |
Asia: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Japan |  |  | 26,439 |  |  |  | 46,010 |  |  |  | 72,570 |  |  |  | 131,950 |
Greater China |  |  | 46,172 |  |  |  | 35,284 |  |  |  | 116,178 |  |  |  | 95,244 |
South Korea |  |  | 17,606 |  |  |  | 14,119 |  |  |  | 43,733 |  |  |  | 41,413 |
Other Asia |  |  | 16,439 |  |  |  | 7,828 |  |  |  | 44,470 |  |  |  | 27,580 |
Total net sales |  | $ | 164,449 |  |  | $ | 159,802 |  |  | $ | 416,099 |  |  | $ | 475,485 |
| Net sales by geography:
|  | Fiscal Year Ended March 27, 2020 |
Americas: |  |  |  |
United States |  | $ | 119,139 |
Other Americas |  |  | 20,883 |
EMEA: |  |  |  |
Europe |  |  | 110,126 |
Asia: |  |  |  |
Japan |  |  | 184,557 |
Greater China |  |  | 121,807 |
South Korea |  |  | 54,707 |
Other Asia |  |  | 38,870 |
Total net sales |  | $ | 650,089 |

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