Retirement Plans and Other Postretirement Benefits (Summary of Liabilities Related to Deferred Compensation Plan) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Mar. 31, 2020
Retirement Plans and Other Postretirement Benefits[Abstract]
Accrued expenses	$ 1,746	$ 1,772
Other long-term liabilities	18,860	15,880
Total deferred compensation	$ 20,606	$ 17,652

Aggregate carrying value as of the balance sheet date of the liabilities for deferred compensation arrangements payable within one year (or the normal operating cycle, if longer). Represents currently earned compensation under cash arrangements (such as a profit-sharing plan, rabbi trust, and employee contract--excluding equity-based arrangements) that is not actually paid until a later date.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 25
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=75028277&loc=d3e19793-108362

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 710
-SubTopic 10
-Section 30
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6409875&loc=d3e20028-108363

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant