Results of Reportable Segments (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Aug. 31, 2013	Aug. 31, 2012	May 31, 2013
Segment Reporting Information [Line Items]
Net Sales	$ 1,164,674	$ 1,046,714
Income (Loss) Before Income Taxes	147,216	72,062
Total Assets	4,063,126	4,115,526	4,115,526
Industrial Segment
Segment Reporting Information [Line Items]
Net Sales	731,226	703,335
Income (Loss) Before Income Taxes	97,581	74,304
Total Assets	2,335,594	2,461,163
Consumer Segment
Segment Reporting Information [Line Items]
Net Sales	433,448	343,379
Income (Loss) Before Income Taxes	82,717	58,788
Total Assets	1,644,161	1,584,336
Corporate/Other
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes	(33,082)	(61,030)
Total Assets	$ 83,371	$ 70,027