Segment Reporting and Related Disclosures (Tables)

6 Months Ended

Nov. 30, 2012

Segment Reporting and Related Disclosures [Abstract]

Revenues from rental, lease and sale segment

	T&M		DP		Total
2012
Rentals and leases	$	30,435	$	4,140	$	34,575
Sales of equipment and other revenues		29,944		673		30,617
	$	60,379	$	4,813	$	65,192
2011
Rentals and leases	$	28,651	$	4,261	$	32,912
Sales of equipment and other revenues		28,113		618		28,731
	$	56,764	$	4,879	$	61,643

	T&M		DP		Total
2012
Rentals and leases	$	60,040	$	8,200	$	68,240
Sales of equipment and other revenues		54,091		1,362		55,453
	$	114,131	$	9,562	$	123,693
2011
Rentals and leases	$	55,253	$	8,968	$	64,221
Sales of equipment and other revenues		54,829		1,243		56,072
	$	110,082	$	10,211	$	120,293

Revenues from external customers and long-lived assets, by geographical areas

	Three Months Ended				Six Months Ended
	November 30,				November 30,
	2012		2011		2012		2011
Revenues: (1)
U.S.	$	56,428	$	53,490	$	105,542	$	103,577
Other (2)		8,764		8,153		18,151		16,716
Total	$	65,192	$	61,643	$	123,693	$	120,293

	As of
	November 30, 2012		May 31, 2012
Net Long-Lived Assets: (3)
U.S.	$	205,078	$	207,449
Other (2)		49,740		49,595
Total	$	254,818	$	257,044