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CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Unrealized (loss) income resulting from changes in fair value of derivative instruments, tax	$ 0	$ 0	$ 0	$ 99
Realized loss (gain) on derivative instruments reclassified into earnings, tax benefit	$ 0	$ 0	$ 0	$ 99

Tax effect of the income statement impact of the reclassification adjustment of accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges realized in net income. Also includes reclassification adjustments of an entity's share of an equity investee's deferred hedging gain (loss) realized in net income.

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