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Subsidiary Guarantors (Schedule of Consolidating Statements of Comprehensive Loss) (Parenthetical) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Unrealized gain (loss) resulting from changes in fair value of derivative instruments, tax	$ 0	$ 0	$ 0	$ 99
Realized loss (gain) on derivative instruments reclassified into earnings, tax provision	0	0	0	99
Parent [Member]
Condensed Financial Statements, Captions [Line Items]
Unrealized gain (loss) resulting from changes in fair value of derivative instruments, tax	0	0	0	99
Realized loss (gain) on derivative instruments reclassified into earnings, tax provision	0	0	0	99
Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Unrealized gain (loss) resulting from changes in fair value of derivative instruments, tax	0	0	0	99
Realized loss (gain) on derivative instruments reclassified into earnings, tax provision	0	0	0	99
Non-Guarantors [Member]
Condensed Financial Statements, Captions [Line Items]
Unrealized gain (loss) resulting from changes in fair value of derivative instruments, tax	0	0	0	99
Realized loss (gain) on derivative instruments reclassified into earnings, tax provision	0	0	0	99
Elimination [Member]
Condensed Financial Statements, Captions [Line Items]
Unrealized gain (loss) resulting from changes in fair value of derivative instruments, tax	0	0	0	99
Realized loss (gain) on derivative instruments reclassified into earnings, tax provision	$ 0	$ 0	$ 0	$ 99

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Tax effect, net of reclassification adjustments, 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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 10A

-Subparagraph (d)

-URI http://asc.fasb.org/extlink&oid=20435746&loc=SL7669646-108580



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e640-108580

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Tax effect of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 130

-Paragraph 25

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 51

-Paragraph 38

-Subparagraph c(3)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e689-108580



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 220

-SubTopic 10

-Section 45

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=20435746&loc=d3e640-108580

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