Revenue - Additional Information (Detail) $ in Thousands	3 Months Ended		9 Months Ended
	Feb. 28, 2021 USD ($)	Feb. 29, 2020 USD ($)	Feb. 28, 2021 USD ($) Segment	Feb. 29, 2020 USD ($)	Nov. 30, 2020 USD ($)	May 31, 2020 USD ($)
Disaggregation Of Revenue [Line Items]
Number of reportable segments | Segment			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
Increase in net contract liabilities	$ 7,769		$ 8,886
Net Sales	1,269,395	$ 1,173,976	4,361,981	$ 4,048,033
Long-term deferred revenue	67,100		67,100		$ 66,900	$ 66,000
General Contracting And Roofing Services
Disaggregation Of Revenue [Line Items]
Net Sales	$ 26,600		$ 41,900