Certain Financial Statement Information - Schedule of Other income, net (Details) (USD $)	12 Months Ended
	Mar. 31, 2013		Mar. 31, 2012		Mar. 31, 2011
Schedule of Other Income, Net
Net (impairment) gain on strategic investments	$ (2,250,000)	[1]	$ 7,147,000	[1]	$ 0	[1]
Write-off of notes receivable and other assets	(1,800,000)	[2]	0	[2]	0	[2]
Net gain (loss) on disposals of property	(21,000)		(10,000)		323,000
Other, net	1,677,000		300,000		474,000
Other income (expense), net	(2,394,000)		7,437,000		797,000
Impariment charge of non-marketable strategic investments	2,300,000		1,000,000
Notes receivable write-off	1,500,000
Asset impairment	$ 300,000

[1] During the fiscal year ended March 31, 2013 and 2012, the Company recognized an impairment charge of its non-marketable strategic investment of $2.3 million and $1.0 million. Refer to Note 2 to the Consolidated Financial Statements for further details.

[2] During the fiscal year ended March 31, 2013, the Company wrote-off $1.5 million of notes receivable due from an investee and $0.3 million related to a prepaid intellectual property license from this investee. The Company also impaired the related equity investment of $2.3 million in this investee - see * above.