Results of Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2016	Nov. 30, 2015	Nov. 30, 2016	Nov. 30, 2015	May 31, 2016
Segment Reporting Information [Line Items]
Net Sales	$ 1,190,770	$ 1,155,984	$ 2,442,833	$ 2,398,510
Income (Loss) Before Income Taxes	(106,857)	120,261	41,618	262,462
Identifiable Assets	4,547,461		4,547,461		$ 4,764,969
Operating Segments | Industrial Segment
Segment Reporting Information [Line Items]
Net Sales	633,429	623,305	1,309,269	1,300,413
Income (Loss) Before Income Taxes	50,291	64,008	139,557	148,476
Identifiable Assets	2,212,754		2,212,754		2,206,062
Operating Segments | Specialty Segment
Segment Reporting Information [Line Items]
Net Sales	183,567	173,625	359,903	343,486
Income (Loss) Before Income Taxes	31,160	28,278	61,664	54,767
Identifiable Assets	736,832		736,832		754,757
Operating Segments | Consumer Segment
Segment Reporting Information [Line Items]
Net Sales	373,774	359,054	773,661	754,611
Income (Loss) Before Income Taxes	(140,575)	65,429	(70,487)	131,552
Identifiable Assets	1,568,657		1,568,657		1,734,600
Corporate/Other
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes	(47,733)	$ (37,454)	(89,116)	$ (72,333)
Identifiable Assets	$ 29,218		$ 29,218		$ 69,550