Acquisitions - Schedule of Consideration Transferred and the Preliminary Fair Value Assigned to Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands		Dec. 01, 2021	Jun. 08, 2021	Feb. 28, 2022	May 31, 2021
Business Acquisition [Line Items]
Goodwill				$ 407,318	$ 351,056
Tempel Steel Company
Business Acquisition [Line Items]
Intangible assets		$ 41,000
Tempel Steel Company | Preliminary Valuation
Business Acquisition [Line Items]
Cash		17,098
Accounts receivable		88,672
Inventories		59,927
Other current assets		10,666
Property, plant and equipment		147,441
Intangible assets		41,000
Operating lease assets		4,098
Total identifiable assets		368,902
Accounts payable		(49,777)
Notes payable		(6,270)
Accrued liabilities		(17,501)
Current operating lease liabilities		(1,614)
Noncurrent operating lease liabilities		(2,484)
Other non-current liabilities	[1]	(40,110)
Net identifiable assets		251,146
Goodwill		38,463
Purchase price		$ 289,609
Shiloh Industries' U S Blank Light
Business Acquisition [Line Items]
Accounts receivable			$ 44,191
Inventories			14,703
Property, plant and equipment			30,342
Intangible assets			36,090
Operating lease assets			59,905
Total identifiable assets			185,231
Accounts payable			(44,822)
Current operating lease liabilities			(1,555)
Noncurrent operating lease liabilities			(58,350)
Net identifiable assets			80,504
Goodwill			24,246
Purchase price			104,750
Shiloh Industries' U S Blank Light | Preliminary Valuation
Business Acquisition [Line Items]
Accounts receivable			44,191
Inventories			13,971
Property, plant and equipment			30,461
Intangible assets			34,280
Operating lease assets			59,905
Total identifiable assets			182,808
Accounts payable			(44,822)
Current operating lease liabilities			(1,555)
Noncurrent operating lease liabilities			(58,350)
Net identifiable assets			78,081
Goodwill			26,669
Purchase price			104,750
Shiloh Industries' U S Blank Light | Measurement Period Adjustments
Business Acquisition [Line Items]
Inventories			732
Property, plant and equipment			(119)
Intangible assets			1,810
Total identifiable assets			2,423
Net identifiable assets			2,423
Goodwill			$ (2,423)

[1] Includes approximately $40,000,000 of net pension and other postretirement benefit obligations assumed as part of the Tempel acquisition.  The excess of projected benefit obligation over the fair value of plans assets was recognized as a liability in accordance with ASC 715 using key inputs including, but not limited to, discount rates and expected rates of return on plan assets.