Discontinued Operations and Held for Sale Businesses - Schedule of Balance Sheet and Income Statement Items (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Feb. 28, 2013	Feb. 29, 2012	Feb. 28, 2013	Feb. 29, 2012	May 31, 2012
Assets:
Inventory	$ 29,645		$ 29,645		$ 30,072
Property Plant and Equipment	9,124		9,124		10,272
Total Assets in Discontinued Operations Held for Sale	38,769		38,769		40,344
Revenue and Income:
Revenue	13,844	12,741	42,758	36,751
Earnings on discontinued operations, before taxes	4,206	1,503	10,070	3,735
Earnings on discontinued operations, net of taxes	$ 2,699	$ 897	$ 6,504	$ 2,442

Overall income (loss) from a disposal group that is classified as a component of the entity, before income tax, reported as a separate component of income before extraordinary items. Includes the following (before income tax): income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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Amount of income (loss) from a disposal group, net of income tax, reported as a separate component of income before extraordinary items after deduction or consideration of the amount allocable to noncontrolling interests. Includes, net of tax, income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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