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Equipment on Long-Term Lease (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2012 Y	May 31, 2005 Y	May 31, 2011
Equipment on Long-Term Lease
Net book value	$ 382,933		$ 324,377
Long-term lease
Equipment on Long-Term Lease
Term of agreements (in years)		10
Purchase of equipment		58,400
Useful life (in years)	10
Residual value (as a percent)	30.00%
Net book value	$ 30,871		$ 32,200

Tangible assets that are held by an entity for use in the production or supply of goods and services, for rental to others, or for administrative purposes and that are expected to provide economic benefit for more than one year; net of accumulated depreciation. Examples include land, buildings, machinery and equipment, and other types of furniture and equipment including, but not limited to, office equipment, furniture and fixtures, and computer equipment and software.

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