Goodwill and Other Long-Lived Assets - Summary of Other Intangible Assets by Class (Detail) - USD ($) $ in Thousands	May 31, 2018	May 31, 2017
Other Intangible Assets [Line Items]
Indefinite-lived intangibles assets, Cost	$ 76,701	$ 14,501
Definite-lived intangibles assets, Cost	212,247	131,414
Total intangible assets, Cost	288,948	145,915
Definite-lived intangible assets, Accumulated Amortization	74,922	63,134
Trademarks
Other Intangible Assets [Line Items]
Indefinite-lived intangibles assets, Cost	76,701	14,501
Customer relationships
Other Intangible Assets [Line Items]
Definite-lived intangibles assets, Cost	173,363	96,262
Definite-lived intangible assets, Accumulated Amortization	57,125	45,822
Non-compete agreements
Other Intangible Assets [Line Items]
Definite-lived intangibles assets, Cost	8,669	9,443
Definite-lived intangible assets, Accumulated Amortization	8,137	7,751
Technology / know-how
Other Intangible Assets [Line Items]
Definite-lived intangibles assets, Cost	26,411	21,755
Definite-lived intangible assets, Accumulated Amortization	5,856	5,607
Other
Other Intangible Assets [Line Items]
Definite-lived intangibles assets, Cost	3,804	3,954
Definite-lived intangible assets, Accumulated Amortization	$ 3,804	$ 3,954