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The Company	12 Months Ended
The Company	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
The Company	Electro Scientific Industries, Inc. and its wholly-owned subsidiaries (ESI or the Company) is a leading supplier of innovative laser-based microfabrication solutions for industries reliant on microtechnologies. ESI enables its customers to commercialize technology using precision laser processes. Founded in 1944, ESI is headquartered in Portland, Oregon, with global operations and subsidiaries in Asia, Europe and North America.