Goodwill and Other Intangibles - Goodwill (Details) $ in Thousands	3 Months Ended	9 Months Ended
Nov. 30, 2019 USD ($) segment item	Aug. 31, 2019 USD ($) segment	May 31, 2019 segment
Changes in the carrying value of goodwill
Balance at the beginning of the period	$ 81,986
Foreign currency translation adjustment	208
Balance at the end of the period	$ 82,194	$ 81,986
Number of operating segments \| segment	3	3	2
Number of reporting units \| item	3
Adhesives, Sealants and Additives
Changes in the carrying value of goodwill
Balance at the beginning of the period	$ 50,090
Foreign currency translation adjustment	196
Balance at the end of the period	50,286	$ 50,090
Industrial Tapes
Changes in the carrying value of goodwill
Balance at the beginning of the period	21,215
Balance at the end of the period	21,215	21,215
Corrosion Protection and Waterproofing
Changes in the carrying value of goodwill
Balance at the beginning of the period	10,681
Foreign currency translation adjustment	12
Balance at the end of the period	$ 10,693	$ 10,681

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266

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Amount of foreign currency translation gain (loss) which increases (decreases) an asset representing future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of reporting units tested for impairment of goodwill. A reporting unit is an operating segment or one level below an operating segment.

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