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Subsidiary Guarantors - Schedule of Consolidating Statement of Comprehensive Income (Loss) (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Condensed Financial Statements, Captions [Line Items]    
Net income (loss) $ (163) $ (8,379)
Other comprehensive income (loss), net of tax:    
Unrealized gain (loss) resulting from changes in fair value of derivative instruments, net (289) (2,083)
Realized loss (gain) on derivative instruments reclassified into earnings, net 164 44
Unrealized gain (loss) resulting from changes in fair value of marketable securities   (6)
Other comprehensive (loss) (125) (2,045)
Comprehensive income (loss) (288) (10,424)
Less: Comprehensive income (loss) attributable to noncontrolling interests 28 (8)
Comprehensive income (loss) attributable to common stockholders (316) (10,416)
Parent [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net income (loss) (191) (8,371)
Other comprehensive income (loss), net of tax:    
Unrealized gain (loss) resulting from changes in fair value of derivative instruments, net   (1,257)
Other comprehensive (loss)   (1,257)
Comprehensive income (loss) (191) (9,628)
Comprehensive income (loss) attributable to common stockholders (191) (9,628)
Guarantors [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net income (loss) 10,143 (1,772)
Other comprehensive income (loss), net of tax:    
Unrealized gain (loss) resulting from changes in fair value of marketable securities   (6)
Other comprehensive (loss)   (6)
Comprehensive income (loss) 10,143 (1,778)
Comprehensive income (loss) attributable to common stockholders 10,143 (1,778)
Non-Guarantors [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net income (loss) (943) (1,801)
Other comprehensive income (loss), net of tax:    
Unrealized gain (loss) resulting from changes in fair value of derivative instruments, net (289)  
Realized loss (gain) on derivative instruments reclassified into earnings, net 164 44
Other comprehensive (loss) (125) 44
Comprehensive income (loss) (1,068) (1,757)
Less: Comprehensive income (loss) attributable to noncontrolling interests 28 (8)
Comprehensive income (loss) attributable to common stockholders (1,096) (1,749)
Elimination [Member]
    
Condensed Financial Statements, Captions [Line Items]    
Net income (loss) (9,172) 3,565
Other comprehensive income (loss), net of tax:    
Unrealized gain (loss) resulting from changes in fair value of derivative instruments, net   (826)
Other comprehensive (loss)   (826)
Comprehensive income (loss) (9,172) 2,739
Comprehensive income (loss) attributable to common stockholders $ (9,172) $ 2,739