Revenue - Additional Information (Detail) $ in Thousands		3 Months Ended	12 Months Ended
		May 31, 2021 USD ($)	May 31, 2021 USD ($) Segment	May 31, 2020 USD ($) Segment	May 31, 2019 USD ($)
Disaggregation Of Revenue [Line Items]
Number of reportable segments | Segment			4	4
Revenue performance obligation description of payment terms			Payment terms and conditions vary by contract type, although our customers’ payment terms generally include a requirement to pay within 30 to 60 days of fulfilling our performance obligations.
Revenue, Practical Expedient, Financing Component [true false]			false
Net contract assets (liabilities)			$ 144
Net Sales	[1]		6,106,288	$ 5,506,994	$ 5,564,551
Long-term deferred revenue		$ 67,800	$ 67,800	$ 66,000
General Contracting And Roofing Services
Disaggregation Of Revenue [Line Items]
Net Sales		$ 200

[1] It is not practicable to obtain the information needed to disclose revenues attributable to each of our product lines.