Results of Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2016	Aug. 31, 2015	May 31, 2016
Segment Reporting Information [Line Items]
Net Sales	$ 1,252,063	$ 1,242,526
Income (Loss) Before Income Taxes	148,475	142,201
Identifiable Assets	4,726,899		$ 4,764,969
Operating Segments | Industrial Segment
Segment Reporting Information [Line Items]
Net Sales	675,840	677,108
Income (Loss) Before Income Taxes	89,266	84,468
Identifiable Assets	2,221,108		2,206,062
Operating Segments | Specialty Segment
Segment Reporting Information [Line Items]
Net Sales	176,336	169,861
Income (Loss) Before Income Taxes	30,504	26,489
Identifiable Assets	743,820		754,757
Operating Segments | Consumer Segment
Segment Reporting Information [Line Items]
Net Sales	399,887	395,557
Income (Loss) Before Income Taxes	70,088	66,123
Identifiable Assets	1,754,113		1,734,600
Corporate/Other
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes	(41,383)	$ (34,879)
Identifiable Assets	$ 7,858		$ 69,550