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Segment Information - Additional Information (Detail)
3 Months Ended 12 Months Ended
May 31, 2016
USD ($)
Feb. 29, 2016
USD ($)
Nov. 30, 2015
USD ($)
Aug. 31, 2015
USD ($)
May 31, 2015
USD ($)
Feb. 28, 2015
USD ($)
Nov. 30, 2014
USD ($)
Aug. 31, 2014
USD ($)
May 31, 2016
USD ($)
Segment
May 31, 2015
USD ($)
May 31, 2014
USD ($)
Segment Reporting Information [Line Items]                      
Number of reportable segments | Segment                 2    
Net Sales $ 90,080,000 $ 76,725,000 $ 79,610,000 $ 74,860,000 $ 78,611,000 $ 68,409,000 $ 68,455,000 $ 67,599,000 $ 321,275,000 $ 283,074,000 $ 247,405,000
Foreign Operations                      
Segment Reporting Information [Line Items]                      
Net Sales                 $ 107,680,000 $ 103,867,000 $ 96,111,000
Net Sales, percentage                 33.50% 36.70% 38.80%
United States                      
Segment Reporting Information [Line Items]                      
Long lived assets percentage 89.00%       95.00%       89.00% 95.00%