Description of the Company	9 Months Ended
Feb. 25, 2023
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 leading global manufacturer of engineered solutions, power grid and microwave tubes and related consumables; power conversion and RF and microwave components; high-value replacement parts, tubes and service training for diagnostic imaging equipment; and customized display solutions. More than 60% of our products are manufactured in LaFox, Illinois, Marlborough, Massachusetts or Donaueschingen, Germany, or by one of our manufacturing partners throughout the world. All our partners manufacture to our strict specifications and per our supplier code of conduct. We serve customers in the 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 provides solutions and adds value through design-in support, systems integration, prototype design and manufacturing, testing, logistics and aftermarket technical service and repair through its global infrastructure. 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. The Company began reporting the results for its new Green Energy Solutions ("GES") segment in the first quarter of fiscal 2023 due to its focus on the power applications that support the green energy market. The GES segment has been carved out of our existing Power and Microwave Technologies (“PMT”) segment. Accordingly, the Company is reporting its financial performance based on four operating and reportable segments. The results for fiscal 2022 presented herein were adjusted to reflect the presentation of the new GES segment separately from the PMT segment. The Company's four operating and reportable segments are defined as follows: Power and Microwave Technologies combines our core engineered solutions capabilities, power grid and microwave tube business with new disruptive RF, Wireless and Power technologies. As a designer, manufacturer, technology partner and authorized distributor, PMT’s strategy is to provide specialized technical expertise and engineered solutions based on our core engineering and manufacturing capabilities on a global basis. We provide solutions and add value through design-in support, systems integration, prototype design and manufacturing, testing, logistics and aftermarket technical service and repair—all through our existing global infrastructure. PMT’s focus is on products for power, RF and microwave applications for customers in 5G, aviation, broadcast, communications, industrial, marine, medical, military, scientific and semiconductor markets. PMT focuses on various applications including broadcast transmission, CO2 laser cutting, diagnostic imaging, dielectric and induction heating, high energy transfer, high voltage switching, plasma, power conversion, radar and radiation oncology. PMT also offers its customers technical services for both microwave and industrial equipment. Green Energy Solutions combines our key technology partners and engineered solutions capabilities to design and manufacture key products for the fast-growing energy storage market and power management applications. As a designer, manufacturer, technology partner and authorized distributor, GES’s strategy is to provide specialized technical expertise and engineered solutions using our core design engineering and manufacturing capabilities on a global basis. We provide solutions and add value through design-in support, systems integration, prototype design and manufacturing, testing, logistics and aftermarket technical service and repair—all through our existing global infrastructure. GES’s focus is on products for numerous green energy applications such as wind, solar, hydrogen and Electric Vehicles, and other power management applications that support green solutions such as synthetic diamond manufacturing. Canvys provides customized display solutions serving the corporate enterprise, financial, healthcare, industrial and medical original equipment manufacturers markets. Our engineers design, manufacture, source and support a full spectrum of solutions to match the needs of our customers. We offer long term availability and proven custom display solutions that include touch screens, protective panels, custom enclosures, All-In-One computers, specialized cabinet finishes and application specific software packages and certification services. We partner with both private label manufacturing companies and leading branded hardware vendors to offer the highest quality display and touch solutions and customized computing platforms. Healthcare manufactures, repairs, refurbishes and distributes high value replacement parts and equipment for the healthcare market including hospitals, medical centers, asset management companies, independent service organizations and multi-vendor service providers. Products include diagnostic imaging replacement parts for CT and MRI systems; replacement CT and MRI tubes; CT service training; MRI coils, cold heads and RF amplifiers; hydrogen thyratrons, klystrons, magnetrons; flat panel detector upgrades; pre-owned CT systems; and additional replacement solutions currently under development for the diagnostic imaging service market. Through a combination of newly developed products and partnerships, service offerings and training programs, we believe we can help our customers improve efficiency while lowering the cost of healthcare delivery. We currently have operations in the following major geographic regions: North America, Asia/Pacific, Europe and Latin America.

Description of the Company

9 Months Ended

Feb. 25, 2023

Organization Consolidation And Presentation Of Financial Statements [Abstract]

1. DESCRIPTION OF THE COMPANY

Richardson Electronics, Ltd. (the "Company", "we", "our") is a leading global manufacturer of engineered solutions, power grid and microwave tubes and related consumables; power conversion and RF and microwave components; high-value replacement parts, tubes and service training for diagnostic imaging equipment; and customized display solutions. More than 60% of our products are manufactured in LaFox, Illinois, Marlborough, Massachusetts or Donaueschingen, Germany, or by one of our manufacturing partners throughout the world. All our partners manufacture to our strict specifications and per our supplier code of conduct. We serve customers in the 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 provides solutions and adds value through design-in support, systems integration, prototype design and manufacturing, testing, logistics and aftermarket technical service and repair through its global infrastructure.

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.

The Company began reporting the results for its new Green Energy Solutions ("GES") segment in the first quarter of fiscal 2023 due to its focus on the power applications that support the green energy market. The GES segment has been carved out of our existing Power and Microwave Technologies (“PMT”) segment. Accordingly, the Company is reporting its financial performance based on four operating and reportable segments. The results for fiscal 2022 presented herein were adjusted to reflect the presentation of the new GES segment separately from the PMT segment.

The Company's four operating and reportable segments are defined as follows:

Power and Microwave Technologies combines our core engineered solutions capabilities, power grid and microwave tube business with new disruptive RF, Wireless and Power technologies. As a designer, manufacturer, technology partner and authorized distributor, PMT’s strategy is to provide specialized technical expertise and engineered solutions based on our core engineering and manufacturing capabilities on a global basis. We provide solutions and add value through design-in support, systems integration, prototype design and manufacturing, testing, logistics and aftermarket technical service and repair—all through our existing global infrastructure. PMT’s focus is on products for power, RF and microwave applications for customers in 5G, aviation, broadcast, communications, industrial, marine, medical, military, scientific and semiconductor markets. PMT focuses on various applications including broadcast transmission, CO2 laser cutting, diagnostic imaging, dielectric and induction heating, high energy transfer, high voltage switching, plasma, power conversion, radar and radiation oncology. PMT also offers its customers technical services for both microwave and industrial equipment.

Green Energy Solutions combines our key technology partners and engineered solutions capabilities to design and manufacture key products for the fast-growing energy storage market and power management applications. As a designer, manufacturer, technology partner and authorized distributor, GES’s strategy is to provide specialized technical expertise and engineered solutions using our core design engineering and manufacturing capabilities on a global basis. We provide solutions and add value through design-in support, systems integration, prototype design and manufacturing, testing, logistics and aftermarket technical service and repair—all through our existing global infrastructure. GES’s focus is on products for numerous green energy applications such as wind, solar, hydrogen and Electric Vehicles, and other power management applications that support green solutions such as synthetic diamond manufacturing.

Canvys provides customized display solutions serving the corporate enterprise, financial, healthcare, industrial and medical original equipment manufacturers markets. Our engineers design, manufacture, source and support a full spectrum of solutions to match the needs of our customers. We offer long term availability and proven custom display solutions that include touch screens, protective panels, custom enclosures, All-In-One computers, specialized cabinet finishes and application specific software packages and certification services. We partner with both private label manufacturing companies and leading branded hardware vendors to offer the highest quality display and touch solutions and customized computing platforms.

Healthcare manufactures, repairs, refurbishes and distributes high value replacement parts and equipment for the healthcare market including hospitals, medical centers, asset management companies, independent service organizations and multi-vendor service providers. Products include diagnostic imaging replacement parts for CT and MRI systems; replacement CT and MRI tubes; CT service training; MRI coils, cold heads and RF amplifiers; hydrogen thyratrons, klystrons, magnetrons; flat panel detector upgrades; pre-owned CT systems; and additional replacement solutions currently under development for the diagnostic imaging service market. Through a combination of newly developed products and partnerships, service offerings and training programs, we believe we can help our customers improve efficiency while lowering the cost of healthcare delivery.

We currently have operations in the following major geographic regions: North America, Asia/Pacific, Europe and Latin America.