Property And Equipment (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2013		Apr. 30, 2012		Apr. 30, 2011
Property, Plant and Equipment [Line Items]
Computer equipment and software	$ 98,538	[1]	$ 75,096	[1]
Leasehold improvements	41,884		42,319
Furniture and fixtures	31,805		29,126
Automobiles	1,725		1,870
Property and equipment, gross	173,952		148,411
Less: accumulated depreciation and amortization	(120,324)		(98,603)
Property and equipment, net	$ 53,628	[2]	$ 49,808	[2]	$ 43,142	[2]

[1] Depreciation expense for capitalized software was $4.0 million, $2.5 million and $2.3 million during fiscal 2013, 2012 and 2011, respectively.

[2] As of the end of the fiscal year.