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Benefit Plans Benefit Plans	12 Months Ended
Benefit Plans Benefit Plans	Mar. 31, 2019
Retirement Benefits [Abstract]
Compensation and Employee Benefit Plans [Text Block]	Benefit Plans: The Company sponsors a 401(k) benefit plan (the Westell Plan), which covers substantially all of Westell, Inc.'s domestic employees. The Westell Plan is a salary reduction plan that allows employees to defer up to 100% of wages subject to Internal Revenue Service limits. The Westell Plan also allows for Company discretionary and matching contributions. In October 2016, the Company established a prospective maximum employer match of $500 per calendar year. Matching contribution expense was $0.1 million in both fiscal years 2019 and 2018.