Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Recurring Fair Value Measurements - USD ($)	Jun. 30, 2019	Mar. 31, 2019
Assets:
Total assets	$ 2,805,000	$ 2,765,000
Liabilities:
Total liabilities	2,645,000	3,102,000
Contingent earn-out consideration
Liabilities:
Total liabilities	1,382,000	1,366,000
Interest rate swap agreement
Liabilities:
Total liabilities	0	580,000
Deferred compensation plans
Liabilities:
Total liabilities	1,263,000	1,156,000
Cash surrender value of life insurance policies
Assets:
Total assets	2,805,000	2,765,000
Quoted Prices In Active Markets for Identical Assets (Level 1)
Assets:
Total assets	0	0
Liabilities:
Total liabilities	1,263,000	1,156,000
Quoted Prices In Active Markets for Identical Assets (Level 1) | Contingent earn-out consideration
Liabilities:
Total liabilities	0	0
Quoted Prices In Active Markets for Identical Assets (Level 1) | Interest rate swap agreement
Liabilities:
Total liabilities		0
Quoted Prices In Active Markets for Identical Assets (Level 1) | Deferred compensation plans
Liabilities:
Total liabilities	1,263,000	1,156,000
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:
Total assets	2,805,000	2,765,000
Liabilities:
Total liabilities	0	580,000
Significant Other Observable Inputs (Level 2) | Contingent earn-out consideration
Liabilities:
Total liabilities	0	0
Significant Other Observable Inputs (Level 2) | Interest rate swap agreement
Liabilities:
Total liabilities		580,000
Significant Other Observable Inputs (Level 2) | Deferred compensation plans
Liabilities:
Total liabilities	0	0
Significant Other Observable Inputs (Level 2) | Cash surrender value of life insurance policies
Assets:
Total assets	2,805,000	2,765,000
Significant Unobservable Inputs (Level 3)
Assets:
Total assets	0	0
Liabilities:
Total liabilities	1,382,000	1,366,000
Significant Unobservable Inputs (Level 3) | Contingent earn-out consideration
Liabilities:
Total liabilities	1,382,000	1,366,000
Significant Unobservable Inputs (Level 3) | Interest rate swap agreement
Liabilities:
Total liabilities		0
Significant Unobservable Inputs (Level 3) | Deferred compensation plans
Liabilities:
Total liabilities	0	0
Significant Unobservable Inputs (Level 3) | Cash surrender value of life insurance policies
Assets:
Total assets	$ 0	$ 0