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Summary of Unaudited Consolidated Statement of Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 28, 2019
Feb. 28, 2018
Feb. 28, 2019
Feb. 28, 2018
May 31, 2018
May 31, 2017
Revenues            
Total revenues $ 97,700 $ 94,903 $ 304,424 $ 289,811 $ 397,930 $ 358,277
Cost of revenues            
Total cost of revenues 53,072 50,302 163,034 152,037 211,658 189,353
Gross margin 44,628 44,601 141,390 137,774 186,272 168,924
Operating Expenses            
Sales and marketing 16,722 16,572 52,454 49,442 66,929 59,380
Total operating expenses 29,989 28,688 92,026 87,439 116,078 103,979
Operating income 14,639 15,913 [1] 49,364 50,335 [2] 70,194 64,945
Product Revenues            
Revenues            
Total revenues 77,375 77,184 249,897 241,200 331,288 303,122
Cost of revenues            
Total cost of revenues 41,902 40,283 132,157 124,520 173,725 156,295
Service Revenues            
Revenues            
Total revenues 20,325 17,719 54,527 48,611 66,642 55,155
Cost of revenues            
Total cost of revenues $ 11,170 10,019 $ 30,877 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   292,965 402,252 361,594
Cost of revenues            
Total cost of revenues   50,371   152,302 212,000 189,626
Gross margin   45,521   140,663 190,252 171,968
Operating Expenses            
Sales and marketing   17,492   52,331 70,909 62,424
Total operating expenses   29,608   90,328 120,058 107,023
Operating income   15,913   50,335 70,194 64,945
Accounting Standards Update 2014-09 | Adjustments            
Revenues            
Total revenues   (989)   (3,154) (4,322) (3,317)
Cost of revenues            
Total cost of revenues   (69)   (265) (342) (273)
Gross margin   (920)   (2,889) (3,980) (3,044)
Operating Expenses            
Sales and marketing   (920)   (2,889) (3,980) (3,044)
Total operating expenses   (920)   (2,889) (3,980) (3,044)
Accounting Standards Update 2014-09 | Product Revenues | Calculated under Revenue Guidance in Effect before Topic 606            
Revenues            
Total revenues   78,142   244,298 335,554 306,512
Cost of revenues            
Total cost of revenues   40,352   124,785 174,067 156,568
Accounting Standards Update 2014-09 | Product Revenues | Adjustments            
Revenues            
Total revenues   (958)   (3,098) (4,266) (3,390)
Cost of revenues            
Total cost of revenues   (69)   (265) (342) (273)
Accounting Standards Update 2014-09 | Service Revenues | Calculated under Revenue Guidance in Effect before Topic 606            
Revenues            
Total revenues   17,750   48,667 66,698 55,082
Cost of revenues            
Total cost of revenues   10,019   27,517 37,933 33,058
Accounting Standards Update 2014-09 | Service Revenues | Adjustments            
Revenues            
Total revenues     $ (56) $ (56) $ 73
[1] Revenues for the three months ended February 28, 2018 have been revised as discussed in Note 1. For the three months ended February 28, 2018, product revenues were reduced by $332,000 in the Food Safety segment and $626,000 in the Animal Safety segment; service revenues were unchanged in the Food Safety segment and were reduced by $31,000 in the Animal Safety segment.
[2] Revenues for the nine months ended February 28, 2018 have been revised as discussed in Note 1. For the nine months ended February 28, 2018, product revenues were reduced by $1,130,000 in the Food Safety segment and $1,968,000 in the Animal Safety segment; service revenues were unchanged in the Food Safety segment and reduced by $56,000 in the Animal Safety segment.