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Business Combinations - Additional Information (Detail) - USD ($) |  |  |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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May 01, 2016 | Apr. 26, 2016 | Dec. 22, 2015 | Aug. 26, 2015 | Jun. 01, 2015 | Dec. 08, 2014 | Oct. 01, 2014 | Jan. 02, 2014 | Nov. 01, 2013 | Jul. 01, 2013 | Feb. 28, 2015 | Oct. 31, 2014 | Aug. 31, 2014 | May 31, 2016 | May 31, 2015 | May 31, 2014
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reversed the remaining contingent consideration accrual to other income |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ (297,000) | $ 38,000
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 years |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  |  |  |  |  |  |  |  |  |  |  | 25 years |  |
Beijing Anapure BioScientific Co., Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for purchase of business |  |  |  |  |  | $ 2,040,000 |  |  |  |  |  |  |  |  |  |
Purchase price allocation for inventory |  |  |  |  |  | 525,000 |  |  |  |  |  |  |  |  |  |
Purchase price allocation for land, property and equipment |  |  |  |  |  | 64,000 |  |  |  |  |  |  |  |  |  |
Purchase price allocation for intangible assets |  |  |  |  |  | $ 422,000 |  |  |  |  |  |  |  |  |  |
Beijing Anapure BioScientific Co., Ltd. | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |
Beijing Anapure BioScientific Co., Ltd. | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |
Sterling Test House |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for purchase of business |  |  |  |  | $ 1,118,000 |  |  |  |  |  |  |  |  |  |  |
Contingent consideration potential payment |  |  |  |  | 150,000 |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for accounts receivable |  |  |  |  | 43,000 |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for inventory |  |  |  |  | 14,000 |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for land, property and equipment |  |  |  |  | 141,000 |  |  |  |  |  |  |  |  |  |  |
Allocation of purchase price for contingent consideration potential payment |  |  |  |  | 97,000 |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for intangible assets |  |  |  |  | $ 345,000 |  |  |  |  |  |  |  |  |  |  |
Lab M Holdings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for purchase of business |  |  |  | $ 12,436,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for accounts receivable |  |  |  | 975,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for inventory |  |  |  | 1,169,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for land, property and equipment |  |  |  | 3,337,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for current liabilities |  |  |  | 1,350,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for intangible assets |  |  |  | 3,918,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for cash |  |  |  | 285,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for other current assets |  |  |  | 596,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for deferred tax liability |  |  |  | $ 784,000 |  |  |  |  |  |  |  |  |  |  |  |
Lab M Holdings | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |  |
Lab M Holdings | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |
SyrVet, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for purchase of business |  |  |  |  |  |  |  |  |  | $ 10,012,000 |  |  |  |  |  |
Contingent consideration potential payment |  |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |  |
Purchase price allocation for accounts receivable |  |  |  |  |  |  |  |  |  | 747,000 |  |  |  |  |  |
Purchase price allocation for inventory |  |  |  |  |  |  |  |  |  | 2,195,000 |  |  |  |  |  |
Purchase price allocation for land, property and equipment |  |  |  |  |  |  |  |  |  | 556,000 |  |  |  |  |  |
Purchase price allocation for current liabilities |  |  |  |  |  |  |  |  |  | 226,000 |  |  |  |  |  |
Allocation of purchase price for contingent consideration potential payment |  |  |  |  |  |  |  |  |  | 930,000 |  |  |  |  |  |
Purchase price allocation for intangible assets |  |  |  |  |  |  |  |  |  | $ 4,810,000 |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |
Cash paid for contingent consideration |  |  |  |  |  |  |  |  |  |  |  |  | $ 689,000 |  |  |
Reversed the remaining contingent consideration accrual to other income |  |  |  |  |  |  |  |  |  |  |  |  | $ 241,000 |  |  |
SyrVet, Inc. | Trademarks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for non-amortizable trademarks |  |  |  |  |  |  |  |  |  | $ 790,000 |  |  |  |  |  |
Prima Tech Incorporated |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for purchase of business |  |  |  |  |  |  |  |  | $ 12,068,000 |  |  |  |  |  |  |
Contingent consideration potential payment |  |  |  |  |  |  |  |  | 600,000 |  |  |  |  |  |  |
Purchase price allocation for accounts receivable |  |  |  |  |  |  |  |  | 963,000 |  |  |  |  |  |  |
Purchase price allocation for inventory |  |  |  |  |  |  |  |  | 2,796,000 |  |  |  |  |  |  |
Purchase price allocation for land, property and equipment |  |  |  |  |  |  |  |  | 1,653,000 |  |  |  |  |  |  |
Purchase price allocation for current liabilities |  |  |  |  |  |  |  |  | 1,840,000 |  |  |  |  |  |  |
Allocation of purchase price for contingent consideration potential payment |  |  |  |  |  |  |  |  | 146,000 |  |  |  |  |  |  |
Purchase price allocation for intangible assets |  |  |  |  |  |  |  |  | 4,400,000 |  |  |  |  |  |  |
Cash paid for contingent consideration |  |  |  |  |  |  |  |  |  |  |  | $ 600,000 |  |  |  |
Purchase price allocation for prepaid assets |  |  |  |  |  |  |  |  | 8,000 |  |  |  |  |  |  |
Cash accrued for contingent consideration |  |  |  |  |  |  |  |  |  |  |  | $ 454,000 |  |  |  |
Prima Tech Incorporated | Trademarks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for non-amortizable trademarks |  |  |  |  |  |  |  |  | $ 1,500,000 |  |  |  |  |  |  |
Prima Tech Incorporated | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Prima Tech Incorporated | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |
Chem Tech Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for purchase of business |  |  |  |  |  |  |  | $ 17,185,000 |  |  |  |  |  |  |  |
Contingent consideration potential payment |  |  |  |  |  |  |  | 1,000,000 |  |  |  |  |  |  |  |
Purchase price allocation for accounts receivable |  |  |  |  |  |  |  | 380,000 |  |  |  |  |  |  |  |
Purchase price allocation for inventory |  |  |  |  |  |  |  | 4,184,000 |  |  |  |  |  |  |  |
Purchase price allocation for land, property and equipment |  |  |  |  |  |  |  | 807,000 |  |  |  |  |  |  |  |
Purchase price allocation for current liabilities |  |  |  |  |  |  |  | 184,000 |  |  |  |  |  |  |  |
Allocation of purchase price for contingent consideration potential payment |  |  |  |  |  |  |  | 390,000 |  |  |  |  |  |  |  |
Purchase price allocation for intangible assets |  |  |  |  |  |  |  | 8,327,000 |  |  |  |  |  |  |  |
Cash paid for contingent consideration |  |  |  |  |  |  |  |  |  |  | $ 474,000 |  |  |  |  |
Purchase price allocation for prepaid assets |  |  |  |  |  |  |  | $ 100,000 |  |  |  |  |  |  |  |
Cash accrued for contingent consideration |  |  |  |  |  |  |  |  |  |  | $ 84,000 |  |  |  |  |
Chem Tech Ltd | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Chem Tech Ltd | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  |  |  |  |  | 25 years |  |  |  |  |  |  |  |
BioLumix, Inc. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for purchase of business |  |  |  |  |  |  | $ 4,514,000 |  |  |  |  |  |  |  |  |
Purchase price allocation for accounts receivable |  |  |  |  |  |  | 499,000 |  |  |  |  |  |  |  |  |
Purchase price allocation for inventory |  |  |  |  |  |  | 421,000 |  |  |  |  |  |  |  |  |
Purchase price allocation for land, property and equipment |  |  |  |  |  |  | 159,000 |  |  |  |  |  |  |  |  |
Purchase price allocation for current liabilities |  |  |  |  |  |  | 155,000 |  |  |  |  |  |  |  |  |
Purchase price allocation for intangible assets |  |  |  |  |  |  | 2,090,000 |  |  |  |  |  |  |  |  |
Purchase price allocation for prepaid assets |  |  |  |  |  |  | 48,000 |  |  |  |  |  |  |  |  |
Purchase price allocation for other receivable |  |  |  |  |  |  | 178,000 |  |  |  |  |  |  |  |  |
Purchase price allocation for long-term liabilities |  |  |  |  |  |  | $ 780,000 |  |  |  |  |  |  |  |  |
BioLumix, Inc. | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |
BioLumix, Inc. | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |
Virbac Corporation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for purchase of business |  |  | $ 3,525,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration potential payment |  |  | 300,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for inventory |  |  | 317,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for land, property and equipment |  |  | 60,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for intangible assets |  |  | $ 2,545,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Virbac Corporation | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |
Virbac Corporation | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |
Deoxi Biotecnologia Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for purchase of business |  | $ 1,560,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contingent consideration potential payment |  | 2,552,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for accounts receivable |  | 150,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for inventory |  | 89,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for land, property and equipment |  | 229,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for current liabilities |  | 246,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocation of purchase price for contingent consideration potential payment |  | 741,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for intangible assets |  | 852,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for other current assets |  | $ 6,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deoxi Biotecnologia Ltd | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Deoxi Biotecnologia Ltd | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tetradyne LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for purchase of business | $ 24,086,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for accounts receivable | 1,588,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for inventory | 1,964,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for land, property and equipment | 1,625,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for current liabilities | 756,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for intangible assets | 10,590,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for long-term liabilities | 660,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for other current assets | $ 338,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tetradyne LLC | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tetradyne LLC | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life | 15 years |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

X
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