CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Jul. 31, 2012	Jul. 31, 2011
Net loss	$ (8,379)	$ (3,062)
Other comprehensive income (loss), net of taxes:
Unrealized (loss) income resulting from changes in fair value of derivative instruments, net of tax provision of $0 and $99	(2,083)	242
Realized income (loss) on derivative instruments reclassified into earnings, net of tax benefit of $0 and $99	44	(355)
Unrealized loss resulting from changes in fair value of marketable securities	(6)	(6)
Other comprehensive loss	(2,045)	(119)
Comprehensive loss	(10,424)	(3,181)
Less: Comprehensive loss attributable to noncontrolling interest	(8)
Comprehensive (loss) income attributable to common stockholders	$ (10,416)	$ (3,181)