Condensed Consolidating Financial Statements (Income Statement) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014
Condensed Financial Statements, Captions [Line Items]
Other Nonoperating Income	$ 10,505	$ 0	$ 10,938	$ 523
Total revenues	128,415	134,628	266,133	268,214
Cost of revenues	226,401	221,697	439,909	419,423
Selling, general and administrative	135,847	97,379	234,039	194,579
Total operating expenses	362,248	319,076	673,948	614,002
Interest expense on borrowings	(14,181)	(13,843)	(22,756)	(27,638)
Other income, net	(210)	(2,282)	(5,195)	(3,486)
Loss from continuing operations before income tax benefit	(237,719)	(200,573)	(424,828)	(376,389)
Income tax benefit	(95,201)	(87,346)	(185,805)	(154,311)
Net loss from continuing operations	(142,518)	(113,227)	(239,023)	(222,078)
Net loss from discontinued operations	(2,489)	1,229	(5,643)	(6,152)
Net loss	(145,007)	(111,998)	(244,666)	(228,230)
Other comprehensive income	(7,974)	1,094	(17,948)	1,400
Comprehensive loss	(152,981)	(110,904)	(262,614)	(226,830)
Block Financial Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Other Nonoperating Income	11,040	2,666	11,535	3,672
Total revenues	13,972	20,891	38,739	44,751
Cost of revenues	9,810	10,851	21,565	22,658
Selling, general and administrative	13,374	5,854	17,750	9,197
Total operating expenses	23,184	16,705	39,315	31,855
Interest expense on borrowings	(14,085)	(13,742)	(22,521)	(27,436)
Other income, net	(276)	(434)	(744)	(2,276)
Loss from continuing operations before income tax benefit	(12,533)	(7,324)	(12,306)	(13,144)
Income tax benefit	(4,047)	(7,020)	(761)	(9,663)
Net loss from continuing operations	(8,486)	(304)	(11,545)	(3,481)
Net loss from discontinued operations	(2,489)	(1,634)	(5,643)	(8,843)
Net loss	(10,975)	(1,938)	(17,188)	(12,324)
Other comprehensive income	(7,257)	4,382	(8,444)	4,261
Comprehensive loss	(18,232)	2,444	(25,632)	(8,063)
Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Other Nonoperating Income	902	(239)	1,456	420
Total revenues	114,471	113,747	227,515	223,556
Cost of revenues	216,618	210,854	418,464	396,853
Selling, general and administrative	119,059	91,527	212,875	185,387
Total operating expenses	335,677	302,381	631,339	582,240
Interest expense on borrowings	(96)	(101)	(235)	(202)
Other income, net	(13,166)	(17,766)	(25,421)	(19,496)
Loss from continuing operations before income tax benefit	(233,566)	(206,740)	(428,024)	(377,962)
Income tax benefit	(88,138)	(77,671)	(180,003)	(139,232)
Net loss from continuing operations	(145,428)	(129,069)	(248,021)	(238,730)
Net loss from discontinued operations		2,863		2,691
Net loss	(145,428)	(126,206)	(248,021)	(236,039)
Other comprehensive income	(7,974)	1,094	(17,948)	1,400
Comprehensive loss	(153,402)	(125,112)	(265,969)	(234,639)
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Other Nonoperating Income	821	1,167	1,730	2,393
Selling, general and administrative	3,415		3,415
Total operating expenses	3,415		3,415
Interest expense on borrowings	0	0	0	0
Other income, net	(145,429)	(115,820)	(248,022)	(236,039)
Loss from continuing operations before income tax benefit	(148,023)	(114,653)	(249,707)	(233,646)
Income tax benefit	(3,016)	(2,655)	(5,041)	(5,416)
Net loss from continuing operations	(145,007)	(111,998)	(244,666)	(228,230)
Net loss from discontinued operations	0	0	0	0
Net loss	(145,007)	(111,998)	(244,666)	(228,230)
Other comprehensive income	(7,974)	1,094	(17,948)	1,400
Comprehensive loss	(152,981)	(110,904)	(262,614)	(226,830)
Intersegment Eliminations [Member]
Condensed Financial Statements, Captions [Line Items]
Other Nonoperating Income	(2,258)	(3,594)	(3,783)	(5,962)
Total revenues	(28)	(10)	(121)	(93)
Cost of revenues	(27)	(8)	(120)	(88)
Selling, general and administrative	(1)	(2)	(1)	(5)
Total operating expenses	(28)	(10)	(121)	(93)
Interest expense on borrowings	0	0	0	0
Other income, net	158,661	131,738	268,992	254,325
Loss from continuing operations before income tax benefit	156,403	128,144	265,209	248,363
Net loss from continuing operations	156,403	128,144	265,209	248,363
Net loss	156,403	128,144	265,209	248,363
Other comprehensive income	15,231	(5,476)	26,392	(5,661)
Comprehensive loss	$ 171,634	$ 122,668	$ 291,601	$ 242,702