Certain Financial Statement Information (Details 7) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Mar. 31, 2012
Schedule of other assets
Non-current portion of prepaid expenses	$ 5,769	$ 4,193
Strategic investments	5,250	4,750
Other		1,331
Other assets	$ 11,019	$ 10,274	[1]

[1] Note: Amounts have been derived from the March 31, 2012 audited consolidated financial statements.