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Discontinued Operations (Details) (Amsterdam component repair facility, USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Nov. 30, 2011 | Nov. 30, 2010 | Nov. 30, 2011 | Nov. 30, 2010
Amsterdam component repair facility |  |  |  |
Discontinued Operations |  |  |  |
Aggregate carrying value of the unit | $ 14,300 |  | $ 14,300 |
Revenues and pre-tax operating loss |  |  |  |
Revenues | 6,020 | 6,532 | 12,265 | 14,336
Pre-tax operating income (loss) | $ 19 | $ (1,962) | $ (464) | $ (2,536)

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