Goodwill and Intangible Assets - Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	May 31, 2018	Feb. 28, 2018
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	10 years 7 months 6 days	10 years 9 months 18 days
Gross Carrying Amount	$ 80,589	$ 78,623
Accumulated Amortization	30,784	29,369
Amortized intangible assets, Net	$ 49,805	$ 49,254
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	15 years 6 months	16 years
Gross Carrying Amount	$ 20,558	$ 19,625
Accumulated Amortization	2,715	2,408
Amortized intangible assets, Net	$ 17,843	$ 17,217
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	7 years 10 months 24 days	8 years 1 month 6 days
Gross Carrying Amount	$ 58,973	$ 58,040
Accumulated Amortization	27,136	26,039
Amortized intangible assets, Net	$ 31,837	$ 32,001
Noncompete [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	4 years 1 month 6 days	1 year 1 month 6 days
Gross Carrying Amount	$ 275	$ 175
Accumulated Amortization	151	140
Amortized intangible assets, Net	$ 124	$ 35
Patent [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	2 months 12 days	4 months 24 days
Gross Carrying Amount	$ 783	$ 783
Accumulated Amortization	782	782
Amortized intangible assets, Net	$ 1	$ 1