Condensed Consolidated Statement of Changes in Stockholders' Equity (USD $) In Thousands	Total USD ($)	Common Stock USD ($)	Treasury Stock	Additional Paid-in Capital USD ($)	Accumulated Other Comprehensive (Loss)/Income USD ($)	Retained Earnings USD ($)
Beginning balance at Apr. 30, 2013	$ 241,349	$ 7		$ 370,397	$ (146)	$ (128,909)
Beginning balance, Shares at Apr. 30, 2013		73,925	(250)
Excess tax benefit related to stock-based expense	93			93
Stock-based expense	7,656			7,656
Exercise of stock options and vested restricted stock units	5,956	1		5,955
Exercise of stock options and vested restricted stock units, shares		1,944
Shares issued under employee stock plans (in shares)		151
Shares issued under employee stock plans	1,039			1,039
Change in foreign currency translation adjustment	133				133
Change in unrealized loss on investments	46				46
Net loss	(31,522)					(31,522)
Ending balance at Oct. 31, 2013	$ 224,750	$ 8		$ 385,140	$ 33	$ (160,431)
Ending balance, Shares at Oct. 31, 2013		76,020	(250)