Carrying Amounts of Major Classes of Assets and Liabilities of Discontinued Operations (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 30, 2014	Apr. 30, 2013
ASSETS:
Accounts receivable, net	$ 1,036	$ 1,679
Prepaid expenses and other current assets	49	69
Total current assets	1,085	1,748
Property and equipment, net	37	132
Goodwill	9,002	9,002
Acquired intangible assets, net	32,813	41,173
Total assets	42,937	52,055
LIABILITIES:
Accounts payable	221	275
Accrued expenses and other current liabilities	895	2,431
Deferred revenue	2,505	3,944
Total Liabilities	$ 3,621	$ 6,650