Fair Value of Financial Instruments - Fair Value Hierarchy (Details) - Recurring - USD ($) $ in Thousands	Mar. 31, 2017	Mar. 31, 2016
Assets:
Total assets	$ 1,506	$ 1,431
Liabilities:
Total liabilities	364	278
Deferred compensation plans
Liabilities:
Total liabilities	364	278
Marketable securities
Assets:
Total assets	319	278
Cash surrender value of life insurance policies
Assets:
Total assets	1,187	1,153
Level 1
Assets:
Total assets	319	278
Liabilities:
Total liabilities	364	278
Level 1 | Deferred compensation plans
Liabilities:
Total liabilities	364	278
Level 1 | Marketable securities
Assets:
Total assets	319	278
Level 1 | Cash surrender value of life insurance policies
Assets:
Total assets	0	0
Level 2
Assets:
Total assets	1,187	1,153
Liabilities:
Total liabilities	0	0
Level 2 | Deferred compensation plans
Liabilities:
Total liabilities	0	0
Level 2 | Marketable securities
Assets:
Total assets	0	0
Level 2 | Cash surrender value of life insurance policies
Assets:
Total assets	1,187	1,153
Level 3
Assets:
Total assets	0	0
Liabilities:
Total liabilities	0	0
Level 3 | Deferred compensation plans
Liabilities:
Total liabilities	0	0
Level 3 | Marketable securities
Assets:
Total assets	0	0
Level 3 | Cash surrender value of life insurance policies
Assets:
Total assets	$ 0	$ 0