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Subsidiary Guarantors - Schedule of Consolidating Statement of Comprehensive Loss (Detail) (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] |  |  |  |
Net income (loss) | $ (11,033) | $ (11,474) | $ (11,771) | $ (40,946)
Other comprehensive income (loss), net of taxes: |  |  |  |
Unrealized gain (loss) resulting from changes in fair value of derivative instruments | 533 | (11) | (35) | (2,810)
Realized loss (gain) on derivative instruments reclassified into earnings | 310 | 149 | 655 | 4,139
Unrealized gain (loss) resulting from changes in fair value of marketable securities | (8) | (11) | 10 | 4
Other comprehensive income (loss) | 835 | 127 | 630 | 1,333
Comprehensive income (loss) | (10,198) | (11,347) | (11,141) | (39,613)
Less: Comprehensive income (loss) attributable to noncontrolling interests | (283) | (67) | (490) | (199)
Comprehensive income (loss) attributable to common stockholders | (9,915) | (11,280) | (10,651) | (39,414)
Parent [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income (loss) | (10,750) | (11,407) | (11,281) | (40,747)
Other comprehensive income (loss), net of taxes: |  |  |  |
Unrealized gain (loss) resulting from changes in fair value of derivative instruments |  |  |  | (1,257)
Realized loss (gain) on derivative instruments reclassified into earnings |  |  |  | 3,625
Other comprehensive income (loss) |  |  |  | 2,368
Comprehensive income (loss) | (10,750) | (11,407) | (11,281) | (38,379)
Comprehensive income (loss) attributable to common stockholders | (10,750) | (11,407) | (11,281) | (38,379)
Guarantors [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income (loss) | (182) | (6,981) | 20,889 | (10,754)
Other comprehensive income (loss), net of taxes: |  |  |  |
Unrealized gain (loss) resulting from changes in fair value of marketable securities | (8) | (11) | 10 | 4
Other comprehensive income (loss) | (8) | (11) | 10 | 4
Comprehensive income (loss) | (190) | (6,992) | 20,899 | (10,750)
Comprehensive income (loss) attributable to common stockholders | (190) | (6,992) | 20,899 | (10,750)
Non-Guarantors [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income (loss) | (179) | (1,566) | (1,527) | (3,769)
Other comprehensive income (loss), net of taxes: |  |  |  |
Unrealized gain (loss) resulting from changes in fair value of derivative instruments | 533 | (11) | (35) | (1,553)
Realized loss (gain) on derivative instruments reclassified into earnings | 310 | 149 | 655 | 514
Other comprehensive income (loss) | 843 | 138 | 620 | (1,039)
Comprehensive income (loss) | 664 | (1,428) | (907) | (4,808)
Less: Comprehensive income (loss) attributable to noncontrolling interests | (283) | (67) | (490) | (199)
Comprehensive income (loss) attributable to common stockholders | 947 | (1,361) | (417) | (4,609)
Elimination [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income (loss) | 78 | 8,480 | (19,852) | 14,324
Other comprehensive income (loss), net of taxes: |  |  |  |
Comprehensive income (loss) | 78 | 8,480 | (19,852) | 14,324
Comprehensive income (loss) attributable to common stockholders | $ 78 | $ 8,480 | $ (19,852) | $ 14,324

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- Definition Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Other Comprehensive Income -URI http://asc.fasb.org/extlink&oid=6519514 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Comprehensive Income -URI http://asc.fasb.org/extlink&oid=16317811 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=28358780&loc=d3e557-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Net Income -URI http://asc.fasb.org/extlink&oid=6518256 + Details
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- Definition Amount after tax of (increase) decrease in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to noncontrolling interests. Excludes changes in equity resulting from investments by owners and distributions to owners. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4613674-111683 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569643-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=31814832&loc=SL4591552-111686 + Details
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- Definition Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) 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 (e) -URI http://asc.fasb.org/extlink&oid=28358780&loc=SL7669646-108580 + Details
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