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Minimum Lease Payments Receivable and Net Investment (Detail) (USD $)
In Thousands, unless otherwise specified
May 31, 2013
May 31, 2012
Sales Type Lease Receivables [Line Items]    
Gross minimum lease payments receivable $ 9,862 $ 12,284
Less-unearned interest (425) (603)
Net investment in sales-type lease receivables $ 9,437 $ 11,681