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Commitments	6 Months Ended
Commitments	Nov. 30, 2011
Commitments [Abstract]
Commitments	4. Commitments During October 2007, we commenced construction on a project to expand our Hunter, Texas cement plant. In May 2009 we temporarily halted construction on the project because we believed that economic and market conditions made it unlikely that cement demand levels in Texas at that time would permit the new kiln to operate profitably if the project was completed as originally scheduled. We resumed construction in October 2010. The total capital cost of the project is expected to be between $365 million and $375 million, excluding capitalized interest, and commissioning is expected to begin within 24 months of the restart of construction. As of November 30, 2011, we have incurred approximately $335.0 million, excluding capitalized interest of approximately $51.1 million related to the project, of which $324.3 million has been paid.

The entire disclosure for significant arrangements with third parties, which includes operating lease arrangements and arrangements in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services, and operating lease arrangements. Descriptions may include identification of the specific goods and services, period of time covered, minimum quantities and amounts, and cancellation rights.

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