Summary Financial Information (Statements of Operations and (Accumulated Deficit) Retained Earnings) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012	Dec. 31, 2011
Net sales	$ 153,225	$ 142,750	$ 452,710	$ 432,373
Cost of products sold	109,428	104,147	322,687	318,897
Gross Profit	43,797	38,603	130,023	113,476
Selling, general and administrative expenses	29,115	27,585	88,652	81,471
Restructuring charges	0	(1,467)		(1,037)
Amortization of intangibles	493	485	1,481	1,515
Total operating expenses	29,608	26,603	90,133	81,949
Operating Income Loss	14,189	12,000	39,890	31,527
Interest and debt expense	3,413	3,590	10,418	10,651
Other (income) and expense, net	4	(1,771)	(1,299)	(2,583)
Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments	10,772	10,181	30,771	23,459
Income Tax Expense Benefit	1,193	1,666	4,504	5,898
Income from discontinued operations		0	0	409
Equity in income from continuing operations of subsidiaries			0	0
Net income (loss)	9,579	8,515	26,267	17,970
Selling expenses	16,390	15,980	49,204	47,515
General and administrative expenses	12,725	11,605	39,448	33,956
Investment income	354	275	1,017	824
Foreign currency exchange (loss) gain	(293)	97	(147)	(121)
Other income, net	(65)	1,399	429	1,880
Income Loss From Continuing Operations Including Portion Attributable To Noncontrolling Interest	9,579	8,515	26,267	17,561
Parent Company [Member]
Net sales	63,278	55,631	180,008	159,172
Cost of products sold	44,711	40,354	128,941	118,157
Gross Profit	18,567	15,277	51,067	41,015
Selling, general and administrative expenses	9,732	9,357	30,061	26,150
Restructuring charges	0			(1,455)
Amortization of intangibles	26	28	73	82
Total operating expenses	9,758	7,918	30,134	24,777
Operating Income Loss	8,809	7,359	20,933	16,238
Interest and debt expense	3,863	2,862	9,961	9,340
Other (income) and expense, net	(991)	(180)	(1,161)	(586)
Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments	5,937	4,677	12,133	7,484
Income Tax Expense Benefit	250	(807)	17	557
Income from discontinued operations				409
Equity in income from continuing operations of subsidiaries	3,892	3,031	14,151	10,634
Net income (loss)	9,579	8,515	26,267	17,970
Guarantor Subsidiaries [Member]
Net sales	34,323	34,900	117,522	121,760
Cost of products sold	27,904	30,007	97,740	105,425
Gross Profit	6,419	4,893	19,782	16,335
Selling, general and administrative expenses	4,866	5,004	15,997	14,756
Restructuring charges				0
Amortization of intangibles				0
Total operating expenses	4,866	5,004	15,997	14,756
Operating Income Loss	1,553	(111)	3,785	1,579
Interest and debt expense	(532)	642	152	1,048
Other (income) and expense, net	(180)	15	(164)	33
Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments	2,265	(768)	3,797	498
Income Tax Expense Benefit	(80)	0	0	169
Equity in income from continuing operations of subsidiaries				0
Net income (loss)	2,345	(768)	3,797	329
Non-Guarantor Subsidiaries [Member]
Net sales	68,439	65,124	195,625	191,495
Cost of products sold	49,628	46,691	136,451	135,369
Gross Profit	18,811	18,433	59,174	56,126
Selling, general and administrative expenses	14,517	13,224	42,594	40,565
Restructuring charges	0			418
Amortization of intangibles	467	457	1,408	1,433
Total operating expenses	14,984	13,681	44,002	42,416
Operating Income Loss	3,827	4,752	15,172	13,710
Interest and debt expense	82	86	305	263
Other (income) and expense, net	1,175	(1,606)	26	(2,030)
Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments	2,570	6,272	14,841	15,477
Income Tax Expense Benefit	1,023	2,473	4,487	5,172
Equity in income from continuing operations of subsidiaries				0
Net income (loss)	1,547	3,799	10,354	10,305
Consolidation, Eliminations [Member]
Net sales	(12,815)	(12,905)	(40,445)	(40,054)
Cost of products sold	(12,815)	(12,905)	(40,445)	(40,054)
Gross Profit		0	0
Amortization of intangibles			0
Total operating expenses			0
Operating Income Loss	0
Other (income) and expense, net			0
Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments		0	0
Income Tax Expense Benefit		0	0
Equity in income from continuing operations of subsidiaries	(3,892)	(3,031)	(14,151)	(10,634)
Net income (loss)	$ (3,892)	$ (3,031)	$ (14,151)	$ (10,634)