Results of Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Aug. 31, 2012		Aug. 31, 2011	May 31, 2012
Segment Reporting Information [Line Items]
Net Sales	$ 1,046,714	[1]	$ 985,918
Income (Loss) Before Income Taxes	60,644	[1]	118,704
Total Assets	3,675,978	[1]		3,561,813
Industrial Segment
Segment Reporting Information [Line Items]
Net Sales	703,335	[1]	667,016
Income (Loss) Before Income Taxes	62,886	[1]	91,546
Total Assets	2,359,243			2,195,702
Consumer Segment
Segment Reporting Information [Line Items]
Net Sales	343,379	[1]	318,902
Income (Loss) Before Income Taxes	58,788	[1]	51,512
Total Assets	1,216,807			1,184,609
Corporate/Other
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes	(61,030)	[1]	(24,354)
Total Assets	$ 99,928			$ 181,502

[1] Restated