Summary Financial Information (Statement of Financial Position) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011
Summary Financial Information [Abstract]
Debt Instrument, Interest Rate, Stated Percentage	7.875%
Assets Current [Abstract]
Cash And Cash Equivalents At Carrying Value	$ 111,937	$ 89,473	$ 82,033	$ 80,139
Accounts Receivable Net Current	78,710	88,642
Inventory Net	101,531	108,055
Prepaid Expense Current	9,111	10,449
Assets Current	301,289	296,619
Property Plant And Equipment Net	60,765	61,709
Goodwill and other intangibles, net	120,342	122,226
Intercompany	0
Other assets	33,346	34,853
Investment in subsidiaries	0	0
Assets	515,742	515,407
Long-term debt, less current portion	151,226	151,889
Other Liabilities Noncurrent	92,035	99,143
Total liabilities	326,282	354,941
Stockholders Equity Including Portion Attributable To Noncontrolling Interest	189,460	160,466
Liabilities And Stockholders Equity	515,742	515,407
Goodwill	106,061	106,435
Intangible Assets Net Excluding Goodwill	14,281	15,791
Marketable Securities Noncurrent	23,699	25,393
Deferred Tax Assets Net Noncurrent	3,033	2,824
Short Term Bank Loans And Notes Payable	0	112
Accounts Payable Trade Current	30,310	40,991
Accrued Liabilities Current	51,603	61,713
Restructuring Reserve Current	0	0
Long Term Debt Current	1,108	1,093
Liabilities Current	83,021	103,909
Senior Long Term Notes	2,881	3,749
Subordinated Long Term Debt	148,345	148,140
Parent Company [Member]
Assets Current [Abstract]
Cash And Cash Equivalents At Carrying Value	67,255	55,958	49,882	45,954
Accounts Receivable Net Current	37,475	44,375
Inventory Net	29,851	29,161
Prepaid Expense Current	4,402	5,398
Assets Current	138,983	134,892
Property Plant And Equipment Net	34,199	32,679
Goodwill and other intangibles, net	40,960	40,906
Intercompany	(184)	(41,502)
Other assets	6,400	6,449
Investment in subsidiaries	203,753	228,138
Assets	424,111	401,562
Long-term debt, less current portion	148,345	148,140
Other Liabilities Noncurrent	51,551	55,476
Total liabilities	234,651	241,096
Stockholders Equity Including Portion Attributable To Noncontrolling Interest	189,460	160,466
Liabilities And Stockholders Equity	424,111	401,562
Liabilities Current	34,755	37,480
Guarantor Subsidiaries [Member]
Assets Current [Abstract]
Cash And Cash Equivalents At Carrying Value	0	5	2,070	7
Accounts Receivable Net Current	3,803	5,579
Inventory Net	16,343	20,087
Prepaid Expense Current	534	502
Assets Current	20,680	26,173
Property Plant And Equipment Net	11,791	13,050
Goodwill and other intangibles, net	31,025	31,025
Intercompany	63,175	102,471
Other assets	783	784
Investment in subsidiaries	0	0
Assets	127,454	173,503
Long-term debt, less current portion	1,731	1,961
Other Liabilities Noncurrent	6,782	6,842
Total liabilities	19,887	27,575
Stockholders Equity Including Portion Attributable To Noncontrolling Interest	107,567	145,928
Liabilities And Stockholders Equity	127,454	173,503
Liabilities Current	11,374	18,772
Non-Guarantor Subsidiaries [Member]
Assets Current [Abstract]
Cash And Cash Equivalents At Carrying Value	44,682	33,510	30,081	34,178
Accounts Receivable Net Current	37,432	38,688
Inventory Net	55,337	61,347
Prepaid Expense Current	4,175	4,004
Assets Current	141,626	137,549
Property Plant And Equipment Net	14,775	15,980
Goodwill and other intangibles, net	48,357	50,295
Intercompany	(61,728)	(61,149)
Other assets	26,163	27,620
Investment in subsidiaries	0	0
Assets	169,193	170,295
Long-term debt, less current portion	1,150	1,788
Other Liabilities Noncurrent	33,702	36,825
Total liabilities	73,007	88,085
Stockholders Equity Including Portion Attributable To Noncontrolling Interest	96,186	82,210
Liabilities And Stockholders Equity	169,193	170,295
Liabilities Current	38,155	49,472
Consolidation, Eliminations [Member]
Assets Current [Abstract]
Inventory Net	0	(2,540)
Prepaid Expense Current	0	545
Assets Current	0	(1,995)
Intercompany	(1,263)	180
Investment in subsidiaries	(203,753)	(228,138)
Assets	(205,016)	(229,953)
Total liabilities	(1,263)	(1,815)
Stockholders Equity Including Portion Attributable To Noncontrolling Interest	(203,753)	(228,138)
Liabilities And Stockholders Equity	(205,016)	(229,953)
Liabilities Current	$ (1,263)	$ (1,815)