Certain Financial Statement Information (Details 5) (USD $) In Thousands, unless otherwise specified			0 Months Ended	6 Months Ended			12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Sep. 30, 2013	Mar. 31, 2013	Apr. 22, 2013 TPack [Member]	Sep. 30, 2013 TPack [Member]	Sep. 30, 2013 Developed technology/in-process research and development [Member]		Mar. 31, 2013 Developed technology/in-process research and development [Member]	Sep. 30, 2013 Customer relationships [Member]	Mar. 31, 2013 Customer relationships [Member]	Sep. 30, 2013 Patents/core technology rights/tradename [Member]	Mar. 31, 2013 Patents/core technology rights/tradename [Member]
Schedule of Purchased Intangible assets
Gross Assets	$ 493,636	$ 517,336			$ 425,000	[1]	$ 441,300	$ 6,330	$ 12,830	$ 62,306	$ 63,206
Accumulated Amortization and Impairments	(493,407)	(505,345)			(425,000)	[1]	(431,771)	(6,101)	(10,507)	(62,306)	(63,067)
Net Assets	229	11,991			0	[1]	9,529	229	2,323	0	139
Weighted average remaining useful life					0 years	[1]	3 years 6 months	10 months 12 days	2 years 1 month 6 days	0 years	3 months 18 days
Intangibles write off			$ (11,404)	$ 11,400

[1] During the quarter ended June 30, 2013, $11.4 million of purchased intangibles were written off pursuant to the sale of TPack. Please refer to Note 8, Sale of TPack A/S, to the Condensed Consolidated Financial Statements for further discussion.