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Disaggregated Revenue (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 29, 2020 | Feb. 28, 2019 | Feb. 29, 2020 | Feb. 28, 2019
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | $ 99,869 | $ 97,700 | $ 309,096 | $ 304,424
Food Safety |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 50,498 | 51,113 | 158,374 | 157,046
Food Safety | Natural Toxins, Allergens & Drug Residues |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 17,154 | 18,612 | 57,950 | 58,021
Food Safety | Bacterial & General Sanitation |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 9,413 | 9,519 | 31,345 | 30,807
Food Safety | Culture Media & Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 11,222 | 11,893 | 35,259 | 36,302
Food Safety | Rodenticides, Insecticides & Disinfectants |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 7,964 | 5,953 | 20,859 | 18,521
Food Safety | Genomics Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 4,745 | 5,136 | 12,961 | 13,395
Animal Safety |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 49,371 | 46,587 | 150,722 | 147,378
Animal Safety | Life Sciences |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 1,376 | 1,823 | 4,901 | 5,794
Animal Safety | Veterinary Instruments & Disposables |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 10,799 | 10,682 | 32,621 | 32,769
Animal Safety | Animal Care & Other |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 6,667 | 6,554 | 20,859 | 21,900
Animal Safety | Rodenticides, Insecticides & Disinfectants |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | 14,558 | 13,525 | 47,462 | 49,460
Animal Safety | Genomics Services |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |
Total Revenues | $ 15,971 | $ 14,003 | $ 44,879 | $ 37,455

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- Definition Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045 + Details
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