Description of Business (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Revenue from External Customer [Line Items]
Operating Income (Loss)	$ 15,820	$ 25,231	$ 17,609	$ 52,274
Revenue from Contract with Customer Benchmark [Member] \| UNITED STATES
Revenue from External Customer [Line Items]
Sales revenue goods net percentage	54.00%	55.00%	54.00%	55.00%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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