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Significant Accounting Policies (Estimated Useful Lives) (Details) | 12 Months Ended
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May 31, 2013
Minimum [Member] | Buildings [Member] |
Property, Plant and Equipment [Line Items] |
Property and equipment, useful lives (years) | 30 years
Minimum [Member] | Building Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Property and equipment, useful lives (years) | 5 years
Minimum [Member] | Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Property and equipment, useful lives (years) | 3 years
Minimum [Member] | Leasehold improvements [Member] |
Property, Plant and Equipment [Line Items] |
Property and equipment, useful lives (years) | 2 years
Maximum [Member] | Buildings [Member] |
Property, Plant and Equipment [Line Items] |
Property and equipment, useful lives (years) | 40 years
Maximum [Member] | Building Improvements [Member] |
Property, Plant and Equipment [Line Items] |
Property and equipment, useful lives (years) | 20 years
Maximum [Member] | Equipment [Member] |
Property, Plant and Equipment [Line Items] |
Property and equipment, useful lives (years) | 10 years
Maximum [Member] | Leasehold improvements [Member] |
Property, Plant and Equipment [Line Items] |
Property and equipment, useful lives (years) | 15 years

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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 Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration