Goodwill and Intangible Assets - Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Aug. 31, 2018	Feb. 28, 2018
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	10 years 4 months 24 days	10 years 9 months 18 days
Gross Carrying Amount	$ 97,759	$ 78,623
Accumulated Amortization	32,289	29,369
Amortized intangible assets, Net	$ 65,470	$ 49,254
Trademarks and Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	14 years 3 months 18 days	16 years
Gross Carrying Amount	$ 24,385	$ 19,625
Accumulated Amortization	3,062	2,408
Amortized intangible assets, Net	$ 21,323	$ 17,217
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	8 years 7 months 6 days	8 years 1 month 6 days
Gross Carrying Amount	$ 71,869	$ 58,040
Accumulated Amortization	28,265	26,039
Amortized intangible assets, Net	$ 43,604	$ 32,001
Noncompete [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	3 years	1 year 1 month 6 days
Gross Carrying Amount	$ 722	$ 175
Accumulated Amortization	179	140
Amortized intangible assets, Net	543	$ 35
Patent [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)		4 months 24 days
Gross Carrying Amount	783	$ 783
Accumulated Amortization	$ 783	782
Amortized intangible assets, Net		$ 1