CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Nov. 30, 2013		Nov. 30, 2012		Nov. 30, 2013		Nov. 30, 2012
Revenues:
Rentals and leases	$ 35,205		$ 34,575		$ 70,862		$ 68,240
Sales of equipment and other revenues	22,671		30,617		47,182		55,453
Total revenues	57,876	[1]	65,192	[1]	118,044	[1]	123,693	[1]
Operating expenses:
Depreciation of rental and lease equipment	14,241		14,082		28,614		28,140
Costs of rentals and leases, excluding depreciation	4,798		4,558		9,610		8,930
Costs of sales of equipment and other revenues	15,699		22,164		33,217		40,213
Selling, general and administrative expenses	14,226		14,068		28,905		27,845
Total operating expenses	48,964		54,872		100,346		105,128
Operating profit	8,912		10,320		17,698		18,565
Interest income, net	87		137		169		283
Income before income taxes	8,999		10,457		17,867		18,848
Income tax provision	3,418		4,218		6,589		7,523
Net income	$ 5,581		$ 6,239		$ 11,278		$ 11,325
Earnings per share:
Basic	$ 0.23		$ 0.26		$ 0.46		$ 0.47
Diluted	$ 0.23		$ 0.26		$ 0.46		$ 0.47
Shares used in per share calculation:
Basic	24,331		23,988		24,313		23,994
Diluted	24,350		24,225		24,340		24,221
Cash dividend declared per share			$ 1.40		$ 0.40		$ 1.60

[1] Revenues by country are based on the location of shipping destination, and not whether the order originates in the United States parent or a foreign subsidiary.