Goodwill and Other Intangible Assets - Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	May 31, 2016	Feb. 29, 2016
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	9 years 2 months 12 days	8 years 8 months 12 days
Gross Carrying Amount	$ 55,861	$ 55,611
Accumulated Amortization	19,797	18,638
Amortized intangible assets, Net	$ 36,064	$ 36,973
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	0 years	0 years
Gross Carrying Amount	$ 1,234	$ 1,234
Accumulated Amortization	$ 1,234	$ 1,234
Customer Lists [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	9 years 2 months 12 days	8 years 8 months 12 days
Gross Carrying Amount	$ 53,669	$ 53,519
Accumulated Amortization	17,965	16,852
Amortized intangible assets, Net	$ 35,704	$ 36,667
Noncompete [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	1 year 7 months 6 days	1 year 9 months 18 days
Gross Carrying Amount	$ 175	$ 75
Accumulated Amortization	42	29
Amortized intangible assets, Net	$ 133	$ 46
Patent [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	1 year 9 months 18 days	2 years
Gross Carrying Amount	$ 783	$ 783
Accumulated Amortization	556	523
Amortized intangible assets, Net	$ 227	$ 260