Segment Information (Continuing Operations By Reportable Operating Segment) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Segment Reporting Information [Line Items]
Revenues	$ 471,979	$ 663,280	$ 705,731	$ 893,097
Loss from continuing operations before tax benefit	(96,268)	(1,026)	(427,825)	(405,556)
Tax Services [Member]
Segment Reporting Information [Line Items]
Revenues	464,634	655,701	684,706	868,144
Loss from continuing operations before tax benefit	(64,189)	31,716	(335,203)	(311,733)
Corporate And Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	7,345	7,579	21,025	24,953
Loss from continuing operations before tax benefit	$ (32,079)	$ (32,742)	$ (92,622)	$ (93,823)