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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, 2017
Feb. 28, 2017
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Life (in years) 11 years 4 months 24 days 8 years 9 months 18 days
Gross Carrying Amount $ 77,238 $ 61,947
Accumulated Amortization 24,836 23,311
Amortized intangible assets, Net $ 52,402 $ 38,636
Trademarks and Trade Names [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Life (in years) 16 years 9 months 18 days 8 years
Gross Carrying Amount $ 18,933 $ 3,642
Accumulated Amortization 1,516 1,234
Amortized intangible assets, Net $ 17,417 $ 2,408
Customer Lists [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Life (in years) 8 years 8 months 12 days 8 years 10 months 25 days
Gross Carrying Amount $ 57,347 $ 57,347
Accumulated Amortization 22,532 21,336
Amortized intangible assets, Net $ 34,815 $ 36,011
Noncompete [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Life (in years) 7 months 6 days 9 months 18 days
Gross Carrying Amount $ 175 $ 175
Accumulated Amortization 100 86
Amortized intangible assets, Net $ 75 $ 89
Patent [Member]    
Finite-Lived Intangible Assets [Line Items]    
Weighted Average Remaining Life (in years) 9 months 18 days 1 year
Gross Carrying Amount $ 783 $ 783
Accumulated Amortization 688 655
Amortized intangible assets, Net $ 95 $ 128