Certain Financial Statement Information - Schedule of Purchased Inatngible Assets (Details) (USD $)			3 Months Ended		12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Jun. 30, 2013 TPack	Mar. 31, 2014 Operating Expense	Mar. 31, 2014 Developed Technology In Process Research And Development	Mar. 31, 2013 Developed Technology In Process Research And Development	Mar. 31, 2014 Customer Relationships	Mar. 31, 2013 Customer Relationships	Mar. 31, 2014 Patents Core Technology Rights Tradename	Mar. 31, 2013 Patents Core Technology Rights Tradename
Finite-Lived Intangible Assets [Line Items]
Intangible assets, Gross	$ 493,636,000	$ 517,336,000			$ 425,000,000	$ 441,300,000	$ 6,330,000	$ 12,830,000	$ 62,306,000	$ 63,206,000
Intangible assets, Accumulated Amortization and Impairments	493,531,000	505,345,000			425,000,000	431,771,000	6,225,000	10,507,000	62,306,000	63,067,000
Intangible assets, Net	105,000	11,991,000			0	9,529,000	105,000	2,323,000	0	139,000
Intangible assets, Weighted average useful remaining life					0 years	3 years 6 months	5 months 12 days	2 years 1 month 6 days	0 years	3 months 18 days
Intangible Assets written off due to sale of business unit			11,400,000
Finite-Lived Intangible Assets, Net, Amortization Expense, Fiscal Year Maturity [Abstract]
Fiscal Years Ending March 31, 2015				$ 105,000