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Subsidiary Guarantors (Schedule of Consolidating Statements of Comprehensive Loss) (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] |  |  |  |
Net income (loss) | $ (11,474) | $ (24,635) | $ (40,946) | $ (28,461)
Other comprehensive income (loss), net of taxes: |  |  |  |
Unrealized gain (loss) resulting from changes in fair value of derivative instruments, net of tax | (11) | (1,981) | (2,810) | (1,798)
Realized loss (gain) on derivative instruments reclassified into earnings, net of tax | 149 | 109 | 4,139 | (607)
Unrealized gain (loss) resulting from changes in fair value of marketable securities | (11) | (16) | 4 | (27)
Other comprehensive income (loss) | 127 | (1,888) | 1,333 | (2,432)
Comprehensive income (loss) | (11,347) | (26,523) | (39,613) | (30,893)
Less: Comprehensive income (loss) attributable to noncontrolling interest | (67) |  | (199) |
Comprehensive income (loss) attributable to common stockholders | (11,280) | (26,523) | (39,414) | (30,893)
Parent [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income (loss) | (11,407) | (24,635) | (40,747) | (28,461)
Other comprehensive income (loss), net of taxes: |  |  |  |
Unrealized gain (loss) resulting from changes in fair value of derivative instruments, net of tax |  | (2,474) | (1,257) | (2,371)
Realized loss (gain) on derivative instruments reclassified into earnings, net of tax |  |  | 3,625 | (78)
Unrealized gain (loss) resulting from changes in fair value of marketable securities |  |  |  |
Other comprehensive income (loss) |  | (2,474) | 2,368 | (2,449)
Comprehensive income (loss) | (11,407) |  | (38,379) |
Less: Comprehensive income (loss) attributable to noncontrolling interest |  |  |  |
Comprehensive income (loss) attributable to common stockholders | (11,407) | (27,109) | (38,379) | (30,910)
Guarantors [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income (loss) | (6,981) | (4,849) | (10,754) | (489)
Other comprehensive income (loss), net of taxes: |  |  |  |
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 | (11) | (16) | 4 | (27)
Other comprehensive income (loss) | (11) | (16) | 4 | (27)
Comprehensive income (loss) | (6,992) |  | (10,750) |
Less: Comprehensive income (loss) attributable to noncontrolling interest |  |  |  |
Comprehensive income (loss) attributable to common stockholders | (6,992) | (4,865) | (10,750) | (462)
Non-Guarantors [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income (loss) | (1,566) | (17,091) | (3,769) | (20,874)
Other comprehensive income (loss), net of taxes: |  |  |  |
Unrealized gain (loss) resulting from changes in fair value of derivative instruments, net of tax | (11) | 493 | (1,553) | 573
Realized loss (gain) on derivative instruments reclassified into earnings, net of tax | 149 | 109 | 514 | (529)
Unrealized gain (loss) resulting from changes in fair value of marketable securities |  |  |  |
Other comprehensive income (loss) | 138 | 602 | (1,039) | 44
Comprehensive income (loss) | (1,428) |  | (4,808) |
Less: Comprehensive income (loss) attributable to noncontrolling interest | (67) |  | (199) |
Comprehensive income (loss) attributable to common stockholders | (1,361) | (16,489) | (4,609) | (20,830)
Elimination [Member] |  |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |  |
Net income (loss) | 8,480 | 21,940 | 14,324 | 20,385
Other comprehensive income (loss), net of taxes: |  |  |  |
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) | 8,480 |  | 14,324 |
Less: Comprehensive income (loss) attributable to noncontrolling interest |  |  |  |
Comprehensive income (loss) attributable to common stockholders | $ 8,480 | $ 21,940 | $ 14,324 | $ 20,385

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