Goodwill and Long-Lived Assets - Summary of Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	3 Months Ended
	Aug. 31, 2021 USD ($)
Goodwill [Line Items]
Balance	$ 351,056
Acquisitions and purchase accounting adjustments	26,906
Translation adjustments	(2,766)
Balance	375,196
Steel Processing
Goodwill [Line Items]
Balance	20,218
Acquisitions and purchase accounting adjustments	26,669
Balance	46,887
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	(1,915)	[1]
Balance	70,358	[1]
Sustainable Energy Solutions
Goodwill [Line Items]
Balance	17,625	[1]
Translation adjustments	(851)	[1]
Balance	$ 16,774	[1]

[1] In connection with the realignment of the Company's pressure cylinders business, as discussed further in Note O - Segment Operations, the goodwill of our former Pressure Cylinders reporting unit was allocated to the new reporting units on a relative fair value basis.