Restructuring and Other Expense (Income), Net - Additional Information (Detail) - USD ($) $ in Thousands		1 Months Ended		3 Months Ended		9 Months Ended
	Nov. 01, 2019	Feb. 29, 2020	Nov. 30, 2019	Feb. 29, 2020	Feb. 28, 2019	Feb. 29, 2020	Feb. 28, 2019
Restructuring Cost and Reserve [Line Items]
Net loss on sale of assets						$ 331
Gain on sale of assets				$ 5,838	$ 12,606	5,237	$ 10,203
Other Non-significant Restructuring Activities
Restructuring Cost and Reserve [Line Items]
Severance expense						187
Facility exit costs						141
Cabs Joint Venture
Restructuring Cost and Reserve [Line Items]
Net gain on deconsolidation	$ 50		$ 50
TWB joint venture | MX
Restructuring Cost and Reserve [Line Items]
Severance expense		$ 232
Expected severance costs		672		672		672
Expected facility exit costs		70		70		70
WSP Joint Venture
Restructuring Cost and Reserve [Line Items]
Severance expense		310
Expected severance costs		2,109		2,109		2,109
Cryogenics
Restructuring Cost and Reserve [Line Items]
Net proceeds from sale of business						8,295
Net loss on sale of assets						481
Engineered Cabs
Restructuring Cost and Reserve [Line Items]
Gain on sale of assets				100
Oil & gas equipment
Restructuring Cost and Reserve [Line Items]
Severance expense				580
Expected severance costs		2,273		2,273		2,273
Expected facility exit costs		$ 500		$ 500		$ 500