Acquisitions - Schedule of Consideration Transferred and the Preliminary Fair Value Assigned to Assets Acquired And Liabilities Assumed (Detail) - USD ($)		Dec. 01, 2021	Jun. 08, 2021	Jan. 29, 2021	May 31, 2022	May 31, 2021	May 31, 2020
Business Acquisition [Line Items]
Goodwill					$ 401,469,000	$ 351,056,000	$ 321,434,000
Shiloh Industries' U.S. BlankLight
Business Acquisition [Line Items]
Accounts receivable			$ 43,695,000
Inventories			15,970,000
Property, plant, and equipment			29,357,000
Intangible assets			36,090,000
Operating lease assets			59,905,000
Total identifiable assets			185,017,000
Accounts payable			(44,894,000)
Current operating lease liabilities			(1,555,000)
Noncurrent operating lease liabilities			(58,350,000)
Net identifiable assets			80,218,000
Goodwill			24,288,000
Purchase price			104,506,000
Shiloh Industries' U.S. BlankLight | Preliminary Valuation
Business Acquisition [Line Items]
Accounts receivable			44,191,000
Inventories			13,971,000
Property, plant, and equipment			30,461,000
Intangible assets			34,280,000
Operating lease assets			59,905,000
Total identifiable assets			182,808,000
Accounts payable			(44,822,000)
Current operating lease liabilities			(1,555,000)
Noncurrent operating lease liabilities			(58,350,000)
Net identifiable assets			78,081,000
Goodwill			26,669,000
Purchase price			104,750,000
Shiloh Industries' U.S. BlankLight | Measurement Period Adjustments
Business Acquisition [Line Items]
Accounts receivable			(496,000)
Inventories			1,999,000
Property, plant, and equipment			(1,104,000)
Intangible assets			1,810,000
Total identifiable assets			2,209,000
Accounts payable			(72,000)
Net identifiable assets			2,137,000
Goodwill			(2,381,000)
Purchase price			$ (244,000)
Tempel Steel Company
Business Acquisition [Line Items]
Cash		$ 17,098,000
Accounts receivable		88,672,000
Inventories		59,927,000
Other current assets		10,648,000
Property, plant, and equipment		147,441,000
Intangible assets		41,000,000
Operating lease assets		4,098,000
Total identifiable assets		368,884,000
Accounts payable		(49,777,000)
Notes payable		(6,270,000)
Accrued liabilities		(17,437,000)
Current operating lease liabilities		(1,614,000)
Noncurrent operating lease liabilities		2,484,000
Other long-term liabilities	[1]	(37,823,000)
Net identifiable assets		253,479,000
Goodwill		35,827,000
Purchase price		289,306,000
Tempel Steel Company | Preliminary Valuation
Business Acquisition [Line Items]
Cash		17,098,000
Accounts receivable		88,672,000
Inventories		59,927,000
Other current assets		10,666,000
Property, plant, and equipment		147,441,000
Intangible assets		41,000,000
Operating lease assets		4,098,000
Total identifiable assets		368,902,000
Accounts payable		(49,777,000)
Notes payable		(6,270,000)
Accrued liabilities		(17,501,000)
Current operating lease liabilities		(1,614,000)
Noncurrent operating lease liabilities		(2,484,000)
Other long-term liabilities	[1]	(40,110,000)
Net identifiable assets		251,146,000
Goodwill		38,462,000
Purchase price		289,608,000
Tempel Steel Company | Measurement Period Adjustments
Business Acquisition [Line Items]
Other current assets		(18,000)
Total identifiable assets		(18,000)
Accrued liabilities		64,000
Other long-term liabilities	[1]	2,287,000
Net identifiable assets		2,333,000
Goodwill		(2,635,000)
Purchase price		$ (302,000)
General Tools & Instruments Company LLC
Business Acquisition [Line Items]
Cash				$ 1,633,000
Accounts receivable				15,442,000
Inventories				19,779,000
Prepaid expenses				751,000
Property, plant, and equipment				956,000
Intangible assets				68,400,000
Operating lease assets				5,502,000
Other assets				30,000
Total identifiable assets				112,493,000
Accounts payable				(2,554,000)
Accrued liabilities				(5,873,000)
Current operating lease liabilities				(657,000)
Other current liabilities				(165,000)
Noncurrent operating lease liabilities				(4,845,000)
Deferred tax liabilities				(11,782,000)
Other long-term liabilities				(230,000)
Net identifiable assets				86,387,000
Goodwill				34,001,000
Purchase price				120,388,000
General Tools & Instruments Company LLC | Preliminary Valuation
Business Acquisition [Line Items]
Cash				1,633,000
Accounts receivable				16,440,000
Inventories				19,795,000
Prepaid expenses				924,000
Other current assets				97,000
Property, plant, and equipment				956,000
Intangible assets				68,400,000
Operating lease assets				5,502,000
Other assets				30,000
Total identifiable assets				113,777,000
Accounts payable				(2,594,000)
Accrued liabilities				(6,006,000)
Current operating lease liabilities				(657,000)
Other current liabilities				(923,000)
Noncurrent operating lease liabilities				(4,845,000)
Deferred tax liabilities				(11,635,000)
Other long-term liabilities				(239,000)
Net identifiable assets				86,878,000
Goodwill				33,714,000
Purchase price				120,592,000
General Tools & Instruments Company LLC | Measurement Period Adjustments
Business Acquisition [Line Items]
Accounts receivable				(998,000)
Inventories				(16,000)
Prepaid expenses				(173,000)
Other current assets				(97,000)
Total identifiable assets				(1,284,000)
Accounts payable				40,000
Accrued liabilities				133,000
Other current liabilities				758,000
Deferred tax liabilities				(147,000)
Other long-term liabilities				9,000
Net identifiable assets				(491,000)
Goodwill				287,000
Purchase price				$ (204,000)

[1] Includes approximately $40,160,000 of net pension and other postretirement benefit obligations assumed as part of the Tempel acquisition. The excess of projected benefit obligations over the fair value of the 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 the plans' assets. See "Note M - Employee Pension Plans" for additional information.