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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)

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