Results of Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended
	Aug. 31, 2018	Aug. 31, 2017
Segment Reporting Information [Line Items]
Net Sales	$ 1,459,989	$ 1,345,394
Income (Loss) Before Income Taxes	91,938	155,284
Domestic
Segment Reporting Information [Line Items]
Net Sales	980,673	874,360
Foreign
Segment Reporting Information [Line Items]
Net Sales	479,316	471,034
Foreign | Canada
Segment Reporting Information [Line Items]
Net Sales	96,777	96,467
Foreign | Europe
Segment Reporting Information [Line Items]
Net Sales	266,577	264,578
Foreign | Latin America
Segment Reporting Information [Line Items]
Net Sales	54,056	51,682
Foreign | Asia Pacific
Segment Reporting Information [Line Items]
Net Sales	42,895	40,038
Foreign | Other Foreign
Segment Reporting Information [Line Items]
Net Sales	19,011	18,269
Operating Segments | Industrial Segment
Segment Reporting Information [Line Items]
Net Sales	781,973	729,768
Income (Loss) Before Income Taxes	69,057	88,902
Operating Segments | Industrial Segment | Domestic
Segment Reporting Information [Line Items]
Net Sales	442,621	399,287
Operating Segments | Industrial Segment | Foreign
Segment Reporting Information [Line Items]
Net Sales	339,352	330,481
Operating Segments | Industrial Segment | Foreign | Canada
Segment Reporting Information [Line Items]
Net Sales	61,009	62,834
Operating Segments | Industrial Segment | Foreign | Europe
Segment Reporting Information [Line Items]
Net Sales	183,114	179,083
Operating Segments | Industrial Segment | Foreign | Latin America
Segment Reporting Information [Line Items]
Net Sales	47,627	45,524
Operating Segments | Industrial Segment | Foreign | Asia Pacific
Segment Reporting Information [Line Items]
Net Sales	30,502	26,667
Operating Segments | Industrial Segment | Foreign | Other Foreign
Segment Reporting Information [Line Items]
Net Sales	17,100	16,373
Operating Segments | Consumer Segment
Segment Reporting Information [Line Items]
Net Sales	485,196	427,144
Income (Loss) Before Income Taxes	51,296	72,368
Operating Segments | Consumer Segment | Domestic
Segment Reporting Information [Line Items]
Net Sales	381,668	324,650
Operating Segments | Consumer Segment | Foreign
Segment Reporting Information [Line Items]
Net Sales	103,528	102,494
Operating Segments | Consumer Segment | Foreign | Canada
Segment Reporting Information [Line Items]
Net Sales	29,006	26,577
Operating Segments | Consumer Segment | Foreign | Europe
Segment Reporting Information [Line Items]
Net Sales	59,577	60,456
Operating Segments | Consumer Segment | Foreign | Latin America
Segment Reporting Information [Line Items]
Net Sales	6,122	5,693
Operating Segments | Consumer Segment | Foreign | Asia Pacific
Segment Reporting Information [Line Items]
Net Sales	6,912	7,872
Operating Segments | Consumer Segment | Foreign | Other Foreign
Segment Reporting Information [Line Items]
Net Sales	1,911	1,896
Operating Segments | Specialty Segment
Segment Reporting Information [Line Items]
Net Sales	192,820	188,482
Income (Loss) Before Income Taxes	27,801	33,167
Operating Segments | Specialty Segment | Domestic
Segment Reporting Information [Line Items]
Net Sales	156,384	150,423
Operating Segments | Specialty Segment | Foreign
Segment Reporting Information [Line Items]
Net Sales	36,436	38,059
Operating Segments | Specialty Segment | Foreign | Canada
Segment Reporting Information [Line Items]
Net Sales	6,762	7,056
Operating Segments | Specialty Segment | Foreign | Europe
Segment Reporting Information [Line Items]
Net Sales	23,886	25,039
Operating Segments | Specialty Segment | Foreign | Latin America
Segment Reporting Information [Line Items]
Net Sales	307	465
Operating Segments | Specialty Segment | Foreign | Asia Pacific
Segment Reporting Information [Line Items]
Net Sales	5,481	5,499
Corporate/Other
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes	$ (56,216)	$ (39,153)