Business Segments - Schedule of Segment Profit and Related Information for Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Revenue:
Products									$ 123,798	$ 105,601	$ 104,769
Support, maintenance and subscription services									77,145	72,711	70,729
Professional services									35,197	30,577	27,183
Gross profit	24,262	23,449	22,081	20,378	20,828	19,932	20,988	18,088	90,170	79,836	75,639
Operating (loss) income									(1,111)	(41,190)	(21,625)
Other expenses, net									139	181	(2,294)
Loss before income taxes									(1,582)	(42,246)	(20,555)
Other Charges:
Asset impairments and related charges	(88)	0	0	208	9,681	0	0	0	120	9,681	959
Legal settlements	1,664	0	0	0					1,664	0	0
Restructuring, severance and other charges	(28)	(31)	430	1,125	5,261	4,558	3,688	2,346	1,496	15,853	405
HSG [Member]
Revenue:
Products	33,517				25,608						35,306
Support, maintenance and subscription services	50,235				47,611						45,053
Professional services	14,610				13,156						13,742
Elimination of intersegment sales	(54)				0						(92)
Revenue from external customers	98,308				86,375						94,009
Gross profit	63,260				55,354						54,669
Gross profit margin	64.30%				64.10%						58.20%
Operating (loss) income	14,428				(6,552)						5,836
Interest expense, net	0				0						0
Other expenses, net	0				0						0
Loss before income taxes	14,428				(6,552)						5,836
Other Charges:
Depreciation of fixed assets and amortization of intangibles	2,663				2,766						2,605
Asset impairments and related charges	120				9,681						959
Legal settlements	0
Restructuring, severance and other charges	871				2,289						0
RSG [Member]
Revenue:
Products	90,281				79,993						69,463
Support, maintenance and subscription services	28,003				25,938						26,146
Professional services	20,622				17,422						13,539
Elimination of intersegment sales	(1,074)				(839)						(476)
Revenue from external customers	137,832				122,514						108,672
Gross profit	26,910				24,482						20,970
Gross profit margin	19.50%				20.00%						19.30%
Operating (loss) income	10,840				5,481						3,164
Interest expense, net	0				0						0
Other expenses, net	0				0						0
Loss before income taxes	10,840				5,481						3,164
Other Charges:
Depreciation of fixed assets and amortization of intangibles	616				728						445
Asset impairments and related charges	0				0						0
Legal settlements	0
Restructuring, severance and other charges	0				606						0
Corporate/Other [Member]
Revenue:
Products	0				0						0
Support, maintenance and subscription services	0				0						0
Professional services	0				0						0
Elimination of intersegment sales	0				0						0
Revenue from external customers	0				0						0
Gross profit	0				0						0
Operating (loss) income	(26,379)				(40,119)						(30,625)
Interest expense, net	332				875						1,224
Other expenses, net	139				181						(2,294)
Loss before income taxes	(26,850)				(41,175)						(29,555)
Other Charges:
Depreciation of fixed assets and amortization of intangibles	2,777				4,794						5,986
Asset impairments and related charges	0				0						0
Legal settlements	1,664
Restructuring, severance and other charges	625				12,958						405
Consolidated Entities [Member]
Revenue:
Products	123,798				105,601						104,769
Support, maintenance and subscription services	78,238				73,549						71,199
Professional services	35,232				30,578						27,281
Elimination of intersegment sales	(1,128)				(839)						(568)
Revenue from external customers	236,140				208,889						202,681
Gross profit	90,170				79,836						75,639
Gross profit margin	38.20%				38.20%						37.30%
Operating (loss) income	(1,111)				(41,190)						(21,625)
Interest expense, net	332				875						1,224
Other expenses, net	139				181						(2,294)
Loss before income taxes	(1,582)				(42,246)						(20,555)
Other Charges:
Depreciation of fixed assets and amortization of intangibles	6,056				8,288						9,036
Asset impairments and related charges	120				9,681						959
Legal settlements	1,664
Restructuring, severance and other charges	$ 1,496				$ 15,853						$ 405