Comprehensive Income (Allocation Of Total Comprehensive Income Between Controlling And Noncontrolling Interests) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Feb. 29, 2012	Feb. 28, 2011	Feb. 29, 2012	Feb. 28, 2011
Comprehensive Income [Abstract]
Net earnings, Controlling Interest	$ 25,880	$ 26,326	$ 63,517	$ 63,149
Net earnings, Noncontrolling Interest	2,518	2,008	7,422	6,321
Net earnings	28,398	28,334	70,939	69,470
Foreign currency translation, Controlling Interest	6,209	4,314	(2,822)	9,766
Foreign currency translation, Noncontrolling Interest	724		(1,617)
Foreign currency translation, Total	6,933	4,314	(4,439)	9,766
Cash flow hedges, Controlling Interest	167	3,007	(713)	1,230
Cash flow hedges, Noncontrolling Interest
Cash flow hedges, Total	167	3,007	(713)	1,230
Pension liability adjustment, Controlling Interest	(431)	(40)	(382)	(28)
Pension liability adjustment, Noncontrolling Interest
Pension liability adjustment, Total	(431)	(40)	(382)	(28)
Total comprehensive income, Controlling Interest	31,825	33,607	59,600	74,117
Total comprehensive income, Noncontrolling Interest	3,242	2,008	5,805	6,321
Total comprehensive income	$ 35,067	$ 35,615	$ 65,405	$ 80,438