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Supplemental Cash Flow Information (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Nov. 30, 2011
Nov. 30, 2010
Supplemental Cash Flow Information [Line Items]    
Income taxes paid, net of refund $ 26,325 $ 14,489
Interest paid 6,739 9,082
Financing receivables:    
Investment in equipment for financing leases    (54)
Principal collections from customers - financing leases 1,203 1,045
Net decrease in financing receivables $ (1,203) $ (991)