Inventories (Narratives) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Business Acquisition [Line Items]
Increase (Decrease) in Inventories	$ (15,411,000)	$ (12,249,000)	$ 8,173,000
LIFO liquidations	109,000		$ 547,000
Net inventories	$ 146,263,000	152,886,000
Sold Businesses [Member]
Business Acquisition [Line Items]
Net inventories		$ 11,534,000