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Minimum Lease Payments Receivable and Net Investment (Detail) (USD $)
In Thousands, unless otherwise specified
Feb. 28, 2013
May 31, 2012
Sales Type Lease Receivables [Line Items]    
Gross minimum lease payments receivable $ 11,518 $ 12,284
Less - unearned interest (533) (603)
Net investment in sales-type lease receivables $ 10,985 $ 11,681