- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References+ Details

Stockholders' Equity - Accumulated Other Comprehensive Income (Loss) (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2013	Oct. 31, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, April 30, 2013			$ (592)
Other comprehensive (loss) income	(80)	3,251	(205)	1,206
Ending balance, October 31, 2013	(797)		(797)
Marketable Securities [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, April 30, 2013			27
Other comprehensive income (loss) before reclassifications			18
Other comprehensive (loss) income			18
Ending balance, October 31, 2013	45		45
Commodity Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance, April 30, 2013			(619)
Other comprehensive income (loss) before reclassifications			(568)
Amounts reclassified from accumulated other comprehensive income (loss)			345
Other comprehensive (loss) income			(223)
Ending balance, October 31, 2013	$ (842)		$ (842)