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Segment Information (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 28, 2019
Feb. 28, 2018
 [1]
Feb. 28, 2019
Feb. 28, 2018
May 31, 2018
May 31, 2017
Segment Reporting Information [Line Items]            
Product revenues to external customers $ 97,700 $ 94,903 $ 304,424 $ 289,811 [2]    
Operating income (loss) 14,639 15,913 49,364 50,335 [2] $ 70,194 $ 64,945
Total assets 672,585 595,601 672,585 595,601 [1] $ 618,009  
Operating Segments | Food Safety            
Segment Reporting Information [Line Items]            
Product revenues to external customers 51,113 47,313 157,046 142,810 [2]    
Operating income (loss) 8,339 8,258 29,554 25,704 [2]    
Total assets 204,570 188,075 204,570 188,075 [1]    
Operating Segments | Animal Safety            
Segment Reporting Information [Line Items]            
Product revenues to external customers 46,587 47,590 147,378 147,001 [2]    
Operating income (loss) 7,338 8,493 23,101 27,691 [2]    
Total assets 221,335 215,371 221,335 215,371 [1]    
Product Revenues            
Segment Reporting Information [Line Items]            
Product revenues to external customers 77,375 77,184 249,897 241,200 [2]    
Product Revenues | Operating Segments | Food Safety            
Segment Reporting Information [Line Items]            
Product revenues to external customers 44,790 42,286 139,979 128,491 [2]    
Product Revenues | Operating Segments | Animal Safety            
Segment Reporting Information [Line Items]            
Product revenues to external customers 32,585 34,898 109,918 112,709 [2]    
Service Revenues            
Segment Reporting Information [Line Items]            
Product revenues to external customers 20,325 17,719 54,527 48,611 [2]    
Service Revenues | Operating Segments | Food Safety            
Segment Reporting Information [Line Items]            
Product revenues to external customers 6,323 5,027 17,067 14,319 [2]    
Service Revenues | Operating Segments | Animal Safety            
Segment Reporting Information [Line Items]            
Product revenues to external customers 14,002 12,692 37,460 34,292 [2]    
Corporate and Eliminations | Operating Segments            
Segment Reporting Information [Line Items]            
Product revenues to external customers 0 [3]   0 [4]      
Operating income (loss) (1,038) [3] (838) [3] (3,291) [4] (3,060) [2],[4]    
Total assets [3] 246,680 $ 192,155 246,680 $ 192,155 [1]    
Corporate and Eliminations | Product Revenues | Operating Segments            
Segment Reporting Information [Line Items]            
Product revenues to external customers 0 [3]   0 [4]      
Corporate and Eliminations | Service Revenues | Operating Segments            
Segment Reporting Information [Line Items]            
Product revenues to external customers $ 0 [3]   $ 0 [4]      
[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.
[3] Includes corporate assets, consisting principally of cash and cash equivalents, marketable securities, current and deferred tax accounts and overhead expenses not allocated to specific business segments. Also includes the elimination of intersegment transactions.
[4] Includes the elimination of intersegment transactions.