Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands		12 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		$ 8,191	$ 7,261	$ 6,308	$ 4,132
Charged to Costs and Expenses		1,080	(345)	2,847
Charged to Other Accounts		343	1,915	(305)
Deductions		493	1,353	366
Balance at End of Period		8,191	7,261	6,308
Allowance for doubtful accounts
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		3,520	2,676	2,177	2,155
Charged to Costs and Expenses		1,184	484	(13)
Charged to Other Accounts		153	1,368	401
Valuation Allowances and Reserves, Reserves of Businesses Acquired		0	0	0
Deductions	[1]	493	1,353	366
Balance at End of Period		3,520	2,676	2,177
Deferred tax asset valuation allowance
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		4,671	4,585	4,131	1,977
Charged to Costs and Expenses		(104)	(829)	2,860
Charged to Other Accounts		190	547	(706)
Valuation Allowances and Reserves, Reserves of Businesses Acquired		0	736	0
Deductions		0	0	0
Balance at End of Period		4,671	4,585	4,131
Accrued general and product liability costs
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Period		13,582	13,335	14,535	$ 12,530
Charged to Costs and Expenses		3,965	7,223	5,277
Charged to Other Accounts		0	0	0
Valuation Allowances and Reserves, Reserves of Businesses Acquired		0	0	1,523
Deductions		3,718	8,423	4,795
Balance at End of Period		$ 13,582	$ 13,335	$ 14,535

[1] SCHEDULE II—Valuation and qualifying accountsMarch 31, 2018, 2017, and 2016 Dollars in thousands Additions Description Balance atBeginningof Period Chargedto CostsandExpenses Chargedto OtherAccountsAcquisition Deductions Balanceat End ofPeriodYear ended March 31, 2018: Deducted from asset accounts: Allowance for doubtful accounts $2,676 $1,184 $153$— $493(1) $3,520Deferred tax asset valuation allowance 4,585 (104) 190— — 4,671Total $7,261 $1,080 $343$— $493 $8,191Reserves on balance sheet: Accrued general and product liability costs $13,335 $3,965 $—$— $3,718(2) $13,582Year ended March 31, 2017: Deducted from asset accounts: Allowance for doubtful accounts $2,177 $484 $1,368$— $1,353(1) $2,676Deferred tax asset valuation allowance 4,131 (829) 547736 — 4,585Total $6,308 $(345) $1,915$736 $1,353 $7,261Reserves on balance sheet: Accrued general and product liability costs $14,535 $7,223 $—$— $8,423(2) $13,335Year ended March 31, 2016: Deducted from asset accounts: Allowance for doubtful accounts $2,155 $(13) $401$— $366(1) $2,177Deferred tax asset valuation allowance 1,977 2,860 (706)— — 4,131Total $4,132 $2,847 $(305)$— $366 $6,308Reserves on balance sheet: Accrued general and product liability costs $12,530 $5,277 $—$1,523 $4,795(2) $14,535 _________________(1)Uncollectible accounts written off, net of recoveries(2)Insurance claims and expenses paid