Goodwill and Other Intangible Assets - Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	May 31, 2014	Feb. 28, 2014
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	6 years 10 months 24 days	7 years 1 month 6 days
Gross Carrying Amount	$ 72,214	$ 72,214
Accumulated Amortization	24,754	23,337
Amortized intangible assets, Net	47,460	48,877
Trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)
Gross Carrying Amount	1,234	1,234
Accumulated Amortization	1,234	1,234
Amortized intangible assets, Net
Customer lists [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	6 years 10 months 24 days	7 years 1 month 6 days
Gross Carrying Amount	70,207	70,207
Accumulated Amortization	23,225	21,840
Amortized intangible assets, Net	46,982	48,367
Patent [Member]
Finite-Lived Intangible Assets [Line Items]
Weighted Average Remaining Life (in years)	3 years 9 months 18 days	4 years
Gross Carrying Amount	773	773
Accumulated Amortization	295	263
Amortized intangible assets, Net	$ 478	$ 510