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Subsidiary Guarantors - Schedule of Consolidating Statement of Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2011
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	$ (54,463)	$ (77,592)	$ 38,428
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) resulting from changes in fair value of derivative instruments, net of tax	(2,910)	(1,749)	1,886
Realized loss (gain) on derivative instruments reclassified into earnings, net of tax	4,247	(578)	(707)
Unrealized gain (loss) resulting from changes in fair value of marketable securities	23	(3)	(16)
Other comprehensive income (loss)	1,360	(2,330)	1,163
Comprehensive income (loss)	(53,103)	(79,922)	39,591
Less: Comprehensive income (loss) attributable to noncontrolling interests	(321)	(6)
Comprehensive (loss) income attributable to common stockholders	(52,782)	(79,916)	39,591
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(54,142)	(77,586)	38,428
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) resulting from changes in fair value of derivative instruments, net of tax	(1,257)	(2,253)	1,607
Realized loss (gain) on derivative instruments reclassified into earnings, net of tax	3,626	(77)	(975)
Unrealized gain (loss) resulting from changes in fair value of marketable securities
Other comprehensive income (loss)	2,369	(2,330)	632
Comprehensive income (loss)	(51,773)	(79,916)
Less: Comprehensive income (loss) attributable to noncontrolling interests
Comprehensive (loss) income attributable to common stockholders	(51,773)	(79,916)	39,060
Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(19,954)	(46,144)	82,465
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) resulting from changes in fair value of derivative instruments, net of tax
Realized loss (gain) on derivative instruments reclassified into earnings, net of tax
Unrealized gain (loss) resulting from changes in fair value of marketable securities	23	(3)	(16)
Other comprehensive income (loss)	23	(3)	(16)
Comprehensive income (loss)	(19,931)	(46,147)
Less: Comprehensive income (loss) attributable to noncontrolling interests
Comprehensive (loss) income attributable to common stockholders	(19,931)	(46,147)	82,449
Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	(5,090)	(20,694)	(4,108)
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) resulting from changes in fair value of derivative instruments, net of tax	(1,653)	504	279
Realized loss (gain) on derivative instruments reclassified into earnings, net of tax	621	(501)	268
Unrealized gain (loss) resulting from changes in fair value of marketable securities
Other comprehensive income (loss)	(1,032)	3	547
Comprehensive income (loss)	(6,122)	(20,691)
Less: Comprehensive income (loss) attributable to noncontrolling interests	(321)	(6)
Comprehensive (loss) income attributable to common stockholders	(5,801)	(20,685)	(3,561)
Elimination [Member]
Condensed Financial Statements, Captions [Line Items]
Net income (loss)	24,723	66,832	(78,357)
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) resulting from changes in fair value of derivative instruments, net of tax
Realized loss (gain) on derivative instruments reclassified into earnings, net of tax
Unrealized gain (loss) resulting from changes in fair value of marketable securities
Other comprehensive income (loss)
Comprehensive income (loss)	24,723	66,832
Less: Comprehensive income (loss) attributable to noncontrolling interests
Comprehensive (loss) income attributable to common stockholders	$ 24,723	$ 66,832	$ (78,357)

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- Definition

The change in equity [net assets] of a business enterprise during a period from transactions and other events and circumstances from non-owner sources which are attributable to the reporting entity. It includes all changes in equity during a period except those resulting from investments by owners and distributions to owners, but excludes any and all transactions which are directly or indirectly attributable to that ownership interest in subsidiary equity which is not attributable to the parent.

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Net of tax amount of the appreciation (loss) in the value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) losses.

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Net of tax and reclassification adjustments amount of the change in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges. Also includes an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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