Fair Value Measurements (Tables)

9 Months Ended

Jan. 31, 2014

Fair Value Measurements [Abstract]

Fair Value Of Assets On Recurring Basis

	Fair Value Measurements
	As of January 31, 2014
		Level 1		Level 2		Level 3
ASSETS:
Money market funds	$	38,877	$	0	$	0
Mutual funds		1,392		0		0
Total assets at fair value	$	40,269	$	0	$	0
	As of April 30, 2013
		Level 1		Level 2		Level 3
ASSETS:
Money market funds	$	38,875	$	0	$	0
Mutual funds		1,311		0		0
Total assets at fair value	$	40,186	$	0	$	0