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CONSOLIDATED STATEMENTS OF COMPREHENSIVE (LOSS) INCOME (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Apr. 30, 2013
Apr. 30, 2012
Apr. 30, 2011
Net (loss) income $ (54,463) $ (77,592) $ 38,428
Other comprehensive income (loss), net of tax:      
Unrealized (loss) gain resulting from changes in fair value of derivative instruments, net of tax provision (benefit) of $0, $99 and ($1,269) (2,910) (1,749) 1,886
Realized loss (gain) on derivative instruments reclassified into earnings, net of tax provision (benefit) of $0, $99 and ($398) 4,247 (578) (707)
Unrealized gain (loss) resulting from changes in fair value of marketable securities, net of tax provision of $0, $0 and $10 23 (3) (16)
Other comprehensive income (loss), net of tax 1,360 (2,330) 1,163
Comprehensive (loss) income (53,103) (79,922) 39,591
Less: Comprehensive loss attributable to noncontrolling interests (321) (6)  
Comprehensive (loss) income attributable to common stockholders $ (52,782) $ (79,916) $ 39,591