Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Recurring Fair Value Measurements - USD ($) $ in Thousands	Dec. 31, 2018	Mar. 31, 2018
Assets
Marketable securities		$ 359
Total assets	$ 2,659	2,366
Liabilities
Total liabilities	1,238	886
Deferred compensation plans
Liabilities
Total liabilities	984	776
Interest rate swap agreement
Liabilities
Total liabilities	254	110
Cash surrender value of life insurance policies
Assets
Total assets	2,659	2,007
Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets
Marketable securities		359
Total assets	0	359
Liabilities
Total liabilities	984	776
Quoted Prices In Active Markets for Identical Assets (Level 1) | Deferred compensation plans
Liabilities
Total liabilities	984	776
Quoted Prices In Active Markets for Identical Assets (Level 1) | Interest rate swap agreement
Liabilities
Total liabilities	0	0
Quoted Prices In Active Markets for Identical Assets (Level 1) | Cash surrender value of life insurance policies
Assets
Total assets	0	0
Significant Other Observable Inputs (Level 2)
Assets
Marketable securities		0
Total assets	2,659	2,007
Liabilities
Total liabilities	254	110
Significant Other Observable Inputs (Level 2) | Deferred compensation plans
Liabilities
Total liabilities	0	0
Significant Other Observable Inputs (Level 2) | Interest rate swap agreement
Liabilities
Total liabilities	254	110
Significant Other Observable Inputs (Level 2) | Cash surrender value of life insurance policies
Assets
Total assets	2,659	2,007
Significant Unobservable Inputs (Level 3)
Assets
Marketable securities		0
Total assets	0	0
Liabilities
Total liabilities	0	0
Significant Unobservable Inputs (Level 3) | Deferred compensation plans
Liabilities
Total liabilities	0	0
Significant Unobservable Inputs (Level 3) | Interest rate swap agreement
Liabilities
Total liabilities	0	0
Significant Unobservable Inputs (Level 3) | Cash surrender value of life insurance policies
Assets
Total assets	$ 0	$ 0