Description of the Company	3 Months Ended
Aug. 30, 2025
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Description of the Company	1. DESCRIPTION OF THE COMPANY Richardson Electronics, Ltd. (the "Company," "we," "our") is a global manufacturer of engineered solutions, green energy products, power grid and microwave tubes, and related consumables; power conversion and RF and microwave components including green energy solutions; tubes for diagnostic imaging equipment; and customized display solutions. We have manufacturing at our facilities located in LaFox, Illinois, Marlborough, Massachusetts, and Donaueschingen, Germany. We serve customers in alternative energy, healthcare, aviation, broadcast, communications, industrial, marine, medical, military, scientific, and semiconductor markets. The Company’s strategy is to provide specialized technical expertise and “engineered solutions” based on our core engineering and manufacturing capabilities. The Company products and services include design-in support, systems integration, prototype design and manufacturing, testing, logistics, and aftermarket technical service and repair. Our products include electron tubes and related components, microwave generators, subsystems used in semiconductor manufacturing and visual technology solutions. These products are used to control, switch or amplify electrical power signals, or are used as display devices in a variety of industrial, commercial, medical and communication applications. On January 24, 2025, the Company sold a substantial portion of the assets of its Healthcare business to DirectMed Imaging, LLC (“DirectMed”), a Delaware limited liability company, and entered into an exclusive 10-year global supply agreement in which Richardson will supply DirectMed with repaired Siemens CT X-ray tubes. Additionally, the Company will continue manufacturing a limited quantity of ALTA CT X-ray tubes exclusively for DirectMed for approximately twelve months. During the year ended May 31, 2025 and prior we had four reportable segments: Power and Microwave Technologies ("PMT"), Green Energy Solutions ("GES"), Canvys, and Healthcare. As of June 1, 2025, we realigned our operating segment structure and now have three segments: PMT, GES and Canvys. The change in operating segments is predicated on how the Company's chief operating decision maker ("CODM") makes operating decisions and assesses business performance. Prior segment information has been recast to reflect the realignment. Refer to Note 9, Segment Information, for discussion of the Company's segment reporting structure, including the recent changes. We currently operate within the following major geographic regions: North America, Asia/Pacific, Europe and Latin America.

Description of the Company

3 Months Ended

Aug. 30, 2025

Organization, Consolidation and Presentation of Financial Statements [Abstract]

1. DESCRIPTION OF THE COMPANY

Richardson Electronics, Ltd. (the "Company," "we," "our") is a global manufacturer of engineered solutions, green energy products, power grid and microwave tubes, and related consumables; power conversion and RF and microwave components including green energy solutions; tubes for diagnostic imaging equipment; and customized display solutions. We have manufacturing at our facilities located in LaFox, Illinois, Marlborough, Massachusetts, and Donaueschingen, Germany.

We serve customers in alternative energy, healthcare, aviation, broadcast, communications, industrial, marine, medical, military, scientific, and semiconductor markets. The Company’s strategy is to provide specialized technical expertise and “engineered solutions” based on our core engineering and manufacturing capabilities. The Company products and services include design-in support, systems integration, prototype design and manufacturing, testing, logistics, and aftermarket technical service and repair. Our products include electron tubes and related components, microwave generators, subsystems used in semiconductor manufacturing and visual technology solutions. These products are used to control, switch or amplify electrical power signals, or are used as display devices in a variety of industrial, commercial, medical and communication applications.

On January 24, 2025, the Company sold a substantial portion of the assets of its Healthcare business to DirectMed Imaging, LLC (“DirectMed”), a Delaware limited liability company, and entered into an exclusive 10-year global supply agreement in which Richardson will supply DirectMed with repaired Siemens CT X-ray tubes. Additionally, the Company will continue manufacturing a limited quantity of ALTA CT X-ray tubes exclusively for DirectMed for approximately twelve months.

During the year ended May 31, 2025 and prior we had four reportable segments: Power and Microwave Technologies ("PMT"), Green Energy Solutions ("GES"), Canvys, and Healthcare. As of June 1, 2025, we realigned our operating segment structure and now have three segments: PMT, GES and Canvys. The change in operating segments is predicated on how the Company's chief operating decision maker ("CODM") makes operating decisions and assesses business performance. Prior segment information has been recast to reflect the realignment. Refer to Note 9, Segment Information, for discussion of the Company's segment reporting structure, including the recent changes.

We currently operate within the following major geographic regions: North America, Asia/Pacific, Europe and Latin America.