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Goodwill and Intangible Assets - Schedule of Intangible Assets, Net (Detail) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 25, 2020 | Mar. 27, 2020 | Mar. 29, 2019
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross | $ 56,037 | $ 36,867 | $ 32,436
Accumulated Amortization | 19,617 | 16,909 | 14,721
Net Carrying Amount | 36,420 | 19,958 | 17,715
Patents |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross | 31,852 | 29,115 | 24,986
Accumulated Amortization | 11,661 | 9,834 | 8,035
Net Carrying Amount | $ 20,191 | $ 19,281 | $ 16,951
Weighted- Average Lives | 10 years | 10 years | 10 years
Customer relationships |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross | $ 6,193 | $ 5,462 | $ 5,205
Accumulated Amortization | 5,823 | 5,335 | 4,946
Net Carrying Amount | $ 370 | $ 127 | $ 259
Weighted- Average Lives | 9 years | 9 years | 9 years
Completed technology |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross | $ 17,150 | $ 1,650 | $ 1,650
Accumulated Amortization | 2,028 | 1,650 | 1,650
Net Carrying Amount | $ 15,122 | 0 |
Weighted- Average Lives | 12 years |  |
Trademarks |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross | $ 810 | 608 | 563
Accumulated Amortization | 73 | 58 | 58
Net Carrying Amount | $ 737 | 550 | 505
Weighted- Average Lives | 5 years |  |
Other |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross | $ 32 | 32 | 32
Accumulated Amortization | 32 | 32 | $ 32
Net Carrying Amount | $ 0 | $ 0 |

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