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Customer-Funded Research & Development (Details) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Oct. 26, 2019 | Oct. 27, 2018 | Oct. 26, 2019 | Oct. 27, 2018
Customer-Funded Research & Development |  |  |  |
Revenue from customer funded research and development | $ 17,506,000 | $ 18,790,000 | $ 32,626,000 | $ 35,907,000

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