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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2013
Jan. 31, 2012
Net loss $ (11,474) $ (24,635) $ (40,946) $ (28,461)
Other comprehensive income (loss), net of tax:        
Unrealized loss resulting from changes in fair value of derivative instruments, net of tax provision of $0, $0, $0 and $99 (11) (1,981) (2,810) (1,798)
Realized loss (gain) on derivative instruments reclassified into earnings, net of tax provision of $0, $0, $0 and $99 149 109 4,139 (607)
Unrealized (loss) gain resulting from changes in fair value of marketable securities (11) (16) 4 (27)
Other comprehensive income (loss), net of tax 127 (1,888) 1,333 (2,432)
Comprehensive loss (11,347) (26,523) (39,613) (30,893)
Less: Comprehensive loss attributable to noncontrolling interest (67)   (199)  
Comprehensive income (loss) attributable to common stockholders $ (11,280) $ (26,523) $ (39,414) $ (30,893)