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Summary of Unaudited Consolidated Statement of Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2018
Feb. 28, 2018
Nov. 30, 2017
Aug. 31, 2017
Nov. 30, 2017
Feb. 28, 2018
May 31, 2018
May 31, 2017
Revenues                
Total revenues $ 99,626 $ 94,918 $ 100,667 $ 94,209 $ 194,876 $ 289,794 $ 397,913 $ 358,277
Cost of revenues                
Total Cost of Revenues 52,897 50,302 52,449 49,285 101,734 152,036 211,658 189,354
Gross Margin 46,729 44,616 48,218 44,924 93,142 137,758 186,255 168,923
Operating Expenses                
Sales and marketing 17,233 16,587 16,762 16,077 32,838 49,426 66,912 59,379
Total Operating expenses 30,250 28,703 30,220 28,500 58,720 87,423 116,061 103,978
Operating Income 16,479 15,913 17,998 16,424 [1] 34,422 50,335 70,194 64,945
Product Revenues                
Revenues                
Total revenues 82,960 77,168 84,472 79,545 164,017 241,184 331,272 303,221
Cost of revenues                
Total Cost of Revenues 42,950 40,283 43,252 40,984 84,236 124,519 173,725 156,296
Service Revenues                
Revenues                
Total revenues 16,666 17,750 16,195 14,664 30,859 48,610 66,641 55,056
Cost of revenues                
Total Cost of Revenues $ 9,947 10,019 9,197 8,301 17,498 27,517 37,933 33,058
Accounting Standards Update 2014-09 | Calculated under Revenue Guidance in Effect before Topic 606                
Revenues                
Total revenues   95,892 101,817 95,256 197,073 292,965 402,252 361,594
Cost of revenues                
Total Cost of Revenues   50,371 52,546 49,385 101,931 152,302 212,000 189,626
Gross Margin   45,521 49,271 45,871 95,142 140,663 190,252 171,968
Operating Expenses                
Sales and marketing   17,492 17,815 17,024 34,838 52,331 70,909 62,424
Total Operating expenses   29,608 31,273 29,447 60,720 90,328 120,058 107,023
Operating Income   15,913 17,998 16,424 34,422 50,335 70,194 64,945
Accounting Standards Update 2014-09 | Adjustments                
Revenues                
Total revenues   (974) (1,150) (1,047) (2,197) (3,171) (4,339) (3,317)
Cost of revenues                
Total Cost of Revenues   (69) (97) (100) (197) (266) (342) (272)
Gross Margin   (905) (1,053) (947) (2,000) (2,905) (3,997) (3,045)
Operating Expenses                
Sales and marketing   (905) (1,053) (947) (2,000) (2,905) (3,997) (3,045)
Total Operating expenses   (905) (1,053) (947) (2,000) (2,905) (3,997) (3,045)
Accounting Standards Update 2014-09 | Product Revenues | Calculated under Revenue Guidance in Effect before Topic 606                
Revenues                
Total revenues   78,142 85,590 80,567 166,157 244,298 335,554 306,512
Cost of revenues                
Total Cost of Revenues   40,352 43,349 41,084 84,433 124,785 174,067 156,568
Accounting Standards Update 2014-09 | Product Revenues | Adjustments                
Revenues                
Total revenues   (974) (1,118) (1,022) (2,140) (3,114) (4,282) (3,291)
Cost of revenues                
Total Cost of Revenues   (69) (97) (100) (197) (266) (342) (272)
Accounting Standards Update 2014-09 | Service Revenues | Calculated under Revenue Guidance in Effect before Topic 606                
Revenues                
Total revenues   17,750 16,227 14,689 30,916 48,667 66,698 55,082
Cost of revenues                
Total Cost of Revenues   $ 10,019 9,197 8,301 17,498 27,517 37,933 33,058
Accounting Standards Update 2014-09 | Service Revenues | Adjustments                
Revenues                
Total revenues     $ (32) $ (25) $ (57) $ (57) $ (57) $ (26)
[1] Segment revenues for the three months ended August 31, 2017 have been revised as discussed in Note 1. For the three month period ended August 31, 2017, product revenues were reduced by $443,000 in the Food Safety segment and $579,000 in the Animal Safety segment; service revenues were unchanged in the Food Safety Segment and were reduced by $25,000 in the Animal Safety segment.