Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended
	Aug. 31, 2011	Aug. 31, 2010
Revenues:
Rentals and leases	$ 31,309	$ 28,787
Sales of equipment and other revenues	27,341	22,038
Total revenues	58,650	50,825
Operating expenses:
Depreciation of rental and lease equipment	12,527	11,656
Costs of revenues other than depreciation of rental and lease equipment	21,610	17,222
Selling, general and administrative expenses	15,893	13,568
Total operating expenses	50,030	42,446
Operating profit	8,620	8,379
Gain on bargain purchase, net of deferred taxes of $2,092 and $107	3,194	153
Interest income, net	99	118
Income before income taxes	11,913	8,650
Income tax provision	3,408	3,429
Net income	$ 8,505	$ 5,221
Earnings per share:
Basic	$ 0.35	$ 0.22
Diluted	$ 0.35	$ 0.22
Shares used in per share calculation:
Basic	23,981	23,964
Diluted	24,132	24,047