Goodwill and Long-Lived Assets - Summary of Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	6 Months Ended
	Nov. 30, 2021 USD ($)
Goodwill [Line Items]
Balance	$ 351,056
Acquisitions and purchase accounting adjustments	25,096
Translation adjustments	(5,961)
Balance	370,191
Steel Processing
Goodwill [Line Items]
Balance	20,218
Acquisitions and purchase accounting adjustments	24,859
Balance	45,077
Consumer products
Goodwill [Line Items]
Balance	240,940	[1]
Acquisitions and purchase accounting adjustments	237	[1]
Balance	241,177	[1]
Building Products
Goodwill [Line Items]
Balance	72,273	[1]
Translation adjustments	(4,073)	[1]
Balance	68,200	[1]
Sustainable Energy Solutions
Goodwill [Line Items]
Balance	17,625	[1]
Translation adjustments	(1,888)	[1]
Balance	$ 15,737	[1]

[1] In connection with the reorganization of the Company's pressure cylinders business, effective June 1, 2021, the goodwill of our former Pressure Cylinders reporting unit was allocated to the new reporting units on a relative fair value basis.  Refer to Note O – Segment Operations for additional information.