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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)

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