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Significant Accounting Policies Estimated Useful Lives (Details) | 12 Months Ended
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May 31, 2012 Years
Buildings [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life, Minimum (in years) | 30
Property, Plant and Equipment, Useful Life, Maximum (in years) | 40
Building Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life, Minimum (in years) | 5
Property, Plant and Equipment, Useful Life, Maximum (in years) | 20
Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life, Minimum (in years) | 3
Property, Plant and Equipment, Useful Life, Maximum (in years) | 10
Leasehold Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Property, Plant and Equipment, Useful Life, Minimum (in years) | 2
Property, Plant and Equipment, Useful Life, Maximum (in years) | 15

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The maximum useful life of long-lived, physical assets used in the normal conduct of business and not intended for resale. 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. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLifeMaximum
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum useful life of long lived, physical assets used in the normal conduct of business and not intended for resale. 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. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLifeMinimum
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | duration