Acquisitions - Additional Information (Details) - USD ($) $ in Thousands							3 Months Ended	12 Months Ended
	Jan. 29, 2021	Jan. 29, 2021	Jan. 04, 2021	Feb. 29, 2020	Oct. 07, 2019	May 01, 2019	Feb. 29, 2020	May 31, 2021	May 31, 2020	Dec. 31, 2019	May 31, 2019
Business Acquisition [Line Items]
Goodwill								$ 351,056	$ 321,434		$ 334,607
Samuel Joint Venture | Miscellaneous Income, Net
Business Acquisition [Line Items]
Gain in pre-tax earnings							$ 6,055
Samuel Joint Venture | Joint Venture Transactions
Business Acquisition [Line Items]
Additional ownership interest acquired in joint venture										31.75%
Total ownership percentage								63.00%
Book value of assets contributed for acquiring ownership interest in joint venture										$ 30,061
Noncontrolling interest										$ 11,123
Percent of ownership interest held in unconsolidated affiliates										31.25%
PTEC Pressure Technology GmbH [Member]
Business Acquisition [Line Items]
Business Combination Consideration Transferred1			$ 10,784
Business combination, total intangible assets			9,247
Goodwill			$ 3,785
General Tools & Instruments Company LLC [Member]
Business Acquisition [Line Items]
Business Combination Consideration Transferred1		$ 120,388
Goodwill	$ 33,568	33,568
Cash consideration for acquired entity	120,388
Acquisition related costs								$ 660
Goodwill, tax basis	$ 11,052	$ 11,052
Heidtman Cleveland
Business Acquisition [Line Items]
Business Combination Consideration Transferred1				$ 29,593
Goodwill				$ 8,024			$ 8,024
Cash consideration for acquired entity					$ 29,593
Estimated useful life of intangible asset acquired					10 years
Magna Industries, Inc.
Business Acquisition [Line Items]
Business Combination Consideration Transferred1						$ 13,500
Business combination, total intangible assets						3,677			3,625
Goodwill									725		$ 777
Business acquisition contingent consideration, estimated fair value						$ 2,000
Payment for contingent consideration									1,150
Amount recognized for post-closing adjustment to net working capital.									$ 310