Condensed Consolidating Financial Statements (Income Statement) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2014	Jan. 31, 2013	Jan. 31, 2014	Jan. 31, 2013
Condensed Financial Statements, Captions [Line Items]
Total revenues	$ 199,770	$ 471,979	$ 461,305	$ 705,731
Cost of revenues	363,537	377,618	794,454	783,053
Selling, general and administrative	174,448	186,997	365,237	352,802
Total expenses	537,985	564,615	1,159,691	1,135,855
Operating loss	(338,215)	(92,636)	(698,386)	(430,124)
Other income (expense), net	(9,610)	(3,632)	(13,295)	2,299
Loss from continuing operations before income tax benefit	(347,825)	(96,268)	(711,681)	(427,825)
Income tax benefit	(135,074)	(79,353)	(282,645)	(204,061)
Net loss from continuing operations	(212,751)	(16,915)	(429,036)	(223,764)
Net loss from discontinued operations	(1,960)	(793)	(5,805)	(6,628)
NET LOSS	(214,711)	(17,708)	(434,841)	(230,392)
Other comprehensive loss	(6,239)	370	(15,326)	(3,090)
Comprehensive loss	(220,950)	(17,338)	(450,167)	(233,482)
Block Financial Issuer [Member]
Condensed Financial Statements, Captions [Line Items]
Total revenues	54,455	58,616	102,840	98,531
Cost of revenues	55,634	68,333	121,925	137,146
Selling, general and administrative	10,346	11,327	25,753	26,288
Total expenses	65,980	79,660	147,678	163,434
Operating loss	(11,525)	(21,044)	(44,838)	(64,903)
Other income (expense), net	232	(4,938)	1,938	(2,428)
Loss from continuing operations before income tax benefit	(11,293)	(25,982)	(42,900)	(67,331)
Income tax benefit	7,602	(31,416)	(3,999)	(46,374)
Net loss from continuing operations	(18,895)	5,434	(38,901)	(20,957)
Net loss from discontinued operations	(2,118)	(483)	(4,834)	(6,503)
NET LOSS	(21,013)	4,951	(43,735)	(27,460)
Other comprehensive loss	(3,052)	(569)	(9,668)	(315)
Comprehensive loss	(24,065)	4,382	(53,403)	(27,775)
Subsidiaries [Member]
Condensed Financial Statements, Captions [Line Items]
Total revenues	146,755	414,858	360,095	608,773
Cost of revenues	309,343	310,776	674,159	647,476
Selling, general and administrative	164,102	175,674	339,484	326,518
Total expenses	473,445	486,450	1,013,643	973,994
Operating loss	(326,690)	(71,592)	(653,548)	(365,221)
Other income (expense), net	(9,842)	1,306	(15,233)	4,727
Loss from continuing operations before income tax benefit	(336,532)	(70,286)	(668,781)	(360,494)
Income tax benefit	(142,676)	(47,937)	(278,646)	(157,687)
Net loss from continuing operations	(193,856)	(22,349)	(390,135)	(202,807)
Net loss from discontinued operations	158	(310)	(971)	(125)
NET LOSS	(193,698)	(22,659)	(391,106)	(202,932)
Other comprehensive loss	(3,187)	939	(5,658)	(2,775)
Comprehensive loss	(196,885)	(21,720)	(396,764)	(205,707)
Intersegment Elimination [Member]
Condensed Financial Statements, Captions [Line Items]
Total revenues	(1,440)	(1,495)	(1,630)	(1,573)
Cost of revenues	(1,440)	(1,491)	(1,630)	(1,569)
Selling, general and administrative		(4)		(4)
Total expenses	(1,440)	(1,495)	(1,630)	(1,573)
Operating loss
Other income (expense), net	347,825	96,268	711,681	427,825
Loss from continuing operations before income tax benefit	347,825	96,268	711,681	427,825
Income tax benefit	135,074	79,353	282,645	204,061
Net loss from continuing operations	212,751	16,915	429,036	223,764
Net loss from discontinued operations	1,960	793	5,805	6,628
NET LOSS	214,711	17,708	434,841	230,392
Other comprehensive loss	6,239	(370)	15,326	3,090
Comprehensive loss	220,950	17,338	450,167	233,482
Parent Company [Member]
Condensed Financial Statements, Captions [Line Items]
Total revenues
Cost of revenues
Selling, general and administrative
Total expenses
Operating loss
Other income (expense), net	(347,825)	(96,268)	(711,681)	(427,825)
Loss from continuing operations before income tax benefit	(347,825)	(96,268)	(711,681)	(427,825)
Income tax benefit	(135,074)	(79,353)	(282,645)	(204,061)
Net loss from continuing operations	(212,751)	(16,915)	(429,036)	(223,764)
Net loss from discontinued operations	(1,960)	(793)	(5,805)	(6,628)
NET LOSS	(214,711)	(17,708)	(434,841)	(230,392)
Other comprehensive loss	(6,239)	370	(15,326)	(3,090)
Comprehensive loss	$ (220,950)	$ (17,338)	$ (450,167)	$ (233,482)