Goodwill and Long-Lived Assets - Summary of Changes in Carrying Amount of Goodwill (Detail) $ in Thousands	9 Months Ended
	Feb. 28, 2022 USD ($)
Goodwill [Line Items]
Balance	$ 351,056
Acquisitions and purchase accounting adjustments	63,143
Translation adjustments	(6,881)
Balance	407,318
Steel Processing
Goodwill [Line Items]
Balance	20,218
Acquisitions and purchase accounting adjustments	62,709
Translation adjustments	(94)
Balance	82,833
Consumer products
Goodwill [Line Items]
Balance	240,940	[1]
Acquisitions and purchase accounting adjustments	434	[1]
Balance	241,374	[1]
Building Products
Goodwill [Line Items]
Balance	72,273	[1]
Translation adjustments	(4,628)	[1]
Balance	67,645	[1]
Sustainable Energy Solutions
Goodwill [Line Items]
Balance	17,625	[1]
Translation adjustments	(2,159)	[1]
Balance	$ 15,466	[1]

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