Summary of Significant Accounting Policies (Tables)

12 Months Ended

Mar. 31, 2012

Summary of Significant Accounting Policies and Composition of Certain Financial Statement Captions [Abstract]

Weighted-average shares outstanding for basic and diluted net income per share

	Fiscal Year Ended March 31,
	2012		2011		2010
Net income	$	75,657	$	61,606	$	48,379
Basic net income per share:
Weighted-average shares outstanding — Basic		58,729		57,894		57,270
Basic net income per common share	$	1.29	$	1.06	$	0.84
Net income	$	75,657	$	61,606	$	48,379
Diluted net income per share:
Weighted-average shares outstanding — Basic		58,729		57,894		57,270
Effect of potentially dilutive securities		320		342		322
Weighted-average shares outstanding — Diluted		59,049		58,236		57,592
Diluted net income per common share	$	1.28	$	1.06	$	0.84

Stock-based compensation expense

	Fiscal Year Ended March 31,
	2012			2011			2010
Costs and expenses:
Cost of revenue	$	261		$	272		$	85
Research and development costs		184			152			108
Selling, general and administrative		2,876			3,324			1,880
Total share-based compensation		3,321			3,748			2,073
Amounts capitalized in software development costs		—			(2	)		(27	)
Amounts charged against earnings, before income tax benefit	$	3,321		$	3,746		$	2,046
Related income tax benefit		(1,236	)		(1,343	)		(608	)
Decrease in net income	$	2,085		$	2,403		$	1,438