Results of Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Nov. 30, 2018	Nov. 30, 2017	Nov. 30, 2018	Nov. 30, 2017
Segment Reporting Information [Line Items]
Net Sales	$ 1,362,531	$ 1,315,416	$ 2,822,520	$ 2,660,810
Income (Loss) Before Income Taxes	66,593	109,181	158,531	264,465
Domestic
Segment Reporting Information [Line Items]
Net Sales	871,386	833,711	1,852,059	1,708,073
Foreign
Segment Reporting Information [Line Items]
Net Sales	491,145	481,705	970,461	952,737
Foreign | Canada
Segment Reporting Information [Line Items]
Net Sales	102,242	92,931	199,019	189,398
Foreign | Europe
Segment Reporting Information [Line Items]
Net Sales	269,842	263,904	536,418	528,481
Foreign | Latin America
Segment Reporting Information [Line Items]
Net Sales	52,503	57,260	106,557	108,942
Foreign | Asia Pacific
Segment Reporting Information [Line Items]
Net Sales	46,719	48,149	89,615	88,186
Foreign | Other Foreign
Segment Reporting Information [Line Items]
Net Sales	19,839	19,461	38,852	37,730
Operating Segments | Industrial Segment
Segment Reporting Information [Line Items]
Net Sales	717,968	702,905	1,499,941	1,432,673
Income (Loss) Before Income Taxes	54,393	67,696	123,450	156,598
Operating Segments | Industrial Segment | Domestic
Segment Reporting Information [Line Items]
Net Sales	375,953	361,932	818,574	761,220
Operating Segments | Industrial Segment | Foreign
Segment Reporting Information [Line Items]
Net Sales	342,015	340,973	681,367	671,453
Operating Segments | Industrial Segment | Foreign | Canada
Segment Reporting Information [Line Items]
Net Sales	61,754	63,217	122,763	126,051
Operating Segments | Industrial Segment | Foreign | Europe
Segment Reporting Information [Line Items]
Net Sales	189,095	183,093	372,209	362,176
Operating Segments | Industrial Segment | Foreign | Latin America
Segment Reporting Information [Line Items]
Net Sales	44,858	49,028	92,485	94,552
Operating Segments | Industrial Segment | Foreign | Asia Pacific
Segment Reporting Information [Line Items]
Net Sales	28,708	28,398	59,211	55,065
Operating Segments | Industrial Segment | Foreign | Other Foreign
Segment Reporting Information [Line Items]
Net Sales	17,600	17,237	34,699	33,609
Operating Segments | Consumer Segment
Segment Reporting Information [Line Items]
Net Sales	432,576	415,431	917,772	842,575
Income (Loss) Before Income Taxes	41,239	45,085	92,535	117,453
Operating Segments | Consumer Segment | Domestic
Segment Reporting Information [Line Items]
Net Sales	336,081	315,642	717,748	640,292
Operating Segments | Consumer Segment | Foreign
Segment Reporting Information [Line Items]
Net Sales	96,495	99,789	200,024	202,283
Operating Segments | Consumer Segment | Foreign | Canada
Segment Reporting Information [Line Items]
Net Sales	23,403	23,660	52,409	50,237
Operating Segments | Consumer Segment | Foreign | Europe
Segment Reporting Information [Line Items]
Net Sales	55,653	57,226	115,229	117,681
Operating Segments | Consumer Segment | Foreign | Latin America
Segment Reporting Information [Line Items]
Net Sales	7,281	7,943	13,402	13,636
Operating Segments | Consumer Segment | Foreign | Asia Pacific
Segment Reporting Information [Line Items]
Net Sales	7,919	8,736	14,831	16,608
Operating Segments | Consumer Segment | Foreign | Other Foreign
Segment Reporting Information [Line Items]
Net Sales	2,239	2,224	4,153	4,121
Operating Segments | Specialty Segment
Segment Reporting Information [Line Items]
Net Sales	211,987	197,080	404,807	385,562
Income (Loss) Before Income Taxes	29,979	34,439	57,780	67,606
Operating Segments | Specialty Segment | Domestic
Segment Reporting Information [Line Items]
Net Sales	159,352	156,137	315,737	306,561
Operating Segments | Specialty Segment | Foreign
Segment Reporting Information [Line Items]
Net Sales	52,635	40,943	89,070	79,001
Operating Segments | Specialty Segment | Foreign | Canada
Segment Reporting Information [Line Items]
Net Sales	17,085	6,054	23,847	13,110
Operating Segments | Specialty Segment | Foreign | Europe
Segment Reporting Information [Line Items]
Net Sales	25,094	23,585	48,980	48,624
Operating Segments | Specialty Segment | Foreign | Latin America
Segment Reporting Information [Line Items]
Net Sales	364	289	670	754
Operating Segments | Specialty Segment | Foreign | Asia Pacific
Segment Reporting Information [Line Items]
Net Sales	10,092	11,015	15,573	16,513
Corporate/Other
Segment Reporting Information [Line Items]
Income (Loss) Before Income Taxes	$ (59,018)	$ (38,039)	$ (115,234)	$ (77,192)