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Goodwill and Other Intangible Assets - Carrying Amount and Accumulated Amortization of Intangible Assets (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Aug. 31, 2015
Feb. 28, 2015
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Life (in years) 9 years 1 month 6 days 9 years 6 months
Gross Carrying Amount $ 77,610 $ 76,752
Accumulated Amortization 32,106 29,116
Amortized intangible assets, Net $ 45,504 $ 47,636
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
Amortized intangible assets, Net $ 0 $ 0
Customer Lists [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Life (in years) 9 years 1 month 6 days 9 years 7 months 6 days
Gross Carrying Amount $ 75,518 $ 74,670
Accumulated Amortization 30,399 27,486
Amortized intangible assets, Net $ 45,119 $ 47,184
Noncompete [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Life (in years) 2 years 3 months 18 days 2 years 9 months 18 days
Gross Carrying Amount $ 75 $ 75
Accumulated Amortization 17 4
Amortized intangible assets, Net $ 58 $ 71
Patent [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Life (in years) 2 years 6 months 3 years
Gross Carrying Amount $ 783 $ 773
Accumulated Amortization 456 392
Amortized intangible assets, Net $ 327 $ 381