Business Segments, Significant Customer and Geographic Information - Percentage of Revenue by Geographic Region (Details) - Sales Revenue, Net - Geographic Concentration Risk	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Non-US
Percentage of revenues by geographic region derived from shipments to, or contract, service and other revenues from, external customers located outside the U.S.
Percentage of total net sales and contract revenues	0.00%	1.00%	1.00%
Canada
Percentage of revenues by geographic region derived from shipments to, or contract, service and other revenues from, external customers located outside the U.S.
Percentage of total net sales and contract revenues	0.00%	1.00%	0.00%
Europe
Percentage of revenues by geographic region derived from shipments to, or contract, service and other revenues from, external customers located outside the U.S.
Percentage of total net sales and contract revenues	0.00%	0.00%	1.00%