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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
May 31, 2020 USD ($) Entity Segment ReportingUnit | May 31, 2019 USD ($) Entity Segment | May 31, 2018 USD ($) Facility Position | Feb. 28, 2019 USD ($)
Significant Of Accounting Policies [Line Items] |  |  |  |
Percentage of controlled subsidiary's earnings | 100.00% |  |  |
Number of business acquisition | Entity | 3 | 5 |  |
Number of reportable segments | Segment | 4 | 3 |  |
Net transactional foreign exchange losses | $ 300,000 | $ (4,800,000) | $ (12,300,000) |
Depreciation | 108,500,000 | 94,000,000.0 | 82,000,000.0 |
Cost of sales | 3,414,139,000 | 3,476,231,000 | 3,305,095,000 |
Bad debt expense | 16,700,000 | 18,600,000 | 9,100,000 |
Inventory write-downs | 39,600,000 | 29,400,000 | 43,700,000 |
Goodwill | $ 1,250,066,000 | 1,245,762,000 | 1,192,174,000 |
Number of operating segments | Segment | 4 |  |  |
Goodwill impairments | $ 0 | 0 | 0 |
Impairment charge of intangible assets |  | 4,200,000 | 0 |
Advertising cost | 49,700,000 | 57,500,000 | 58,000,000.0 |
Research and development cost | 76,500,000 | 71,600,000 | 69,700,000 |
Realized losses on sales of available-for-sale securities | 700,000 | 3,000,000.0 |  |
Realized gains on trading securities | 900,000 | 500,000 |  |
Unrealized losses on trading securities | 400,000 | 1,300,000 |  |
Unrealized gain on marketable equity securities | 1,800,000 |  |  |
Unrealized losses on marketable equity securities |  | 4,600,000 |  |
Gross gains realized on sales of marketable securities |  |  | 11,900,000 |
Gross losses realized on sales of marketable securities |  |  | 1,800,000 |
Cost of Sales | Third Party |  |  |  |
Significant Of Accounting Policies [Line Items] |  |  |  |
Cost of sales |  | $ 173,600,000 |  |
Type of Cost, Good or Service [Extensible List] |  | us-gaap:ShippingAndHandlingMember |  |
SG&A | Third Party |  |  |  |
Significant Of Accounting Policies [Line Items] |  |  |  |
Cost of sales |  |  | $ 164,700,000 |
Type of Cost, Good or Service [Extensible List] |  |  | us-gaap:ShippingAndHandlingMember |
CPG Segment |  |  |  |
Significant Of Accounting Policies [Line Items] |  |  |  |
Number of business acquisition | Entity |  | 2 |  |
Inventory write-downs |  | $ 1,000,000.0 | $ 1,200,000 |
Goodwill | 405,354,000 | 407,429,000 | 372,033,000 |
Impairment charge of indefinite lived intangible assets |  | 2,000,000.0 |  |
CPG Segment | Europe |  |  |  |
Significant Of Accounting Policies [Line Items] |  |  |  |
Goodwill |  |  |  | $ 125,000,000.0
Consumer Segment |  |  |  |
Significant Of Accounting Policies [Line Items] |  |  |  |
Fair value of adjustment of deferred income taxes |  | 2,800,000 |  |
Inventory write-downs | 28,800,000 | 10,500,000 | $ 36,500,000 |
Number of manufacturing facilities closed | Facility |  |  | 2 |
Number of positions eliminated | Position |  |  | 154 |
Goodwill | 496,218,000 | 499,387,000 | $ 477,718,000 |
Impairment loss of indefinite lived intangible assets on annual impairment tests | 0 | 0 |  |
Impairment charge of indefinite lived intangible assets | 4,000,000.0 |  |  |
PCG Segment |  |  |  |
Significant Of Accounting Policies [Line Items] |  |  |  |
Inventory write-downs | 3,200,000 | 9,000,000.0 |  |
Goodwill | $ 185,404,000 | $ 185,259,000 | 186,775,000 |
Industrial Segment |  |  |  |
Significant Of Accounting Policies [Line Items] |  |  |  |
Number of operating segments | Segment |  | 2 |  |
Wood Finishes Group |  |  |  |
Significant Of Accounting Policies [Line Items] |  |  |  |
Number of reporting units | ReportingUnit | 2 |  |  |
Kop-Coat Group |  |  |  |
Significant Of Accounting Policies [Line Items] |  |  |  |
Number of reporting units | ReportingUnit | 2 |  |  |
SPG reportable segment |  |  |  |
Significant Of Accounting Policies [Line Items] |  |  |  |
Goodwill | $ 163,090,000 | $ 153,687,000 | $ 155,648,000 |
Impairment charge of definite lived intangible assets |  | $ 2,200,000 |  |
Minimum | CPG Segment | Europe |  |  |  |
Significant Of Accounting Policies [Line Items] |  |  |  |
Percentage of fair value over carrying value |  |  |  | 9.00%

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