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Business Combinations - Additional Information (Detail) - USD ($) |  |  |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended
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Jun. 01, 2015 | Dec. 08, 2014 | Oct. 01, 2014 | Jan. 02, 2014 | Nov. 01, 2013 | Jul. 01, 2013 | Jan. 02, 2013 | Oct. 01, 2012 | Feb. 28, 2015 | Oct. 31, 2014 | Aug. 31, 2014 | Oct. 31, 2013 | May. 31, 2015 | May. 31, 2014 | May. 31, 2013
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Reversed the remaining contingent consideration accrual to other income |  |  |  |  |  |  |  |  |  |  |  |  | $ (297,000) | $ 38,000 | $ (14,000)
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 |  |
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 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 |  |  |  |  |  |  |  |  |
Cash paid for contingent consideration |  |  |  |  |  |  |  |  |  |  | $ 689,000 |  |  |  |
Finite lived intangible assets, useful life |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |
Macleod Pharmaceuticals |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for purchase of business |  |  |  |  |  |  |  | $ 9,918,000 |  |  |  |  |  |  |
Contingent consideration potential payment |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |
Purchase price allocation for accounts receivable |  |  |  |  |  |  |  | 353,000 |  |  |  |  |  |  |
Purchase price allocation for inventory |  |  |  |  |  |  |  | 1,238,000 |  |  |  |  |  |  |
Purchase price allocation for property and equipment |  |  |  |  |  |  |  | 300,000 |  |  |  |  |  |  |
Purchase price allocation for current liabilities |  |  |  |  |  |  |  | 82,000 |  |  |  |  |  |  |
Purchase price allocation for deferred tax liabilities, current |  |  |  |  |  |  |  | 2,054,000 |  |  |  |  |  |  |
Allocation of purchase price for contingent consideration potential payment |  |  |  |  |  |  |  | 100,000 |  |  |  |  |  |  |
Purchase price allocation for intangible assets |  |  |  |  |  |  |  | $ 5,542,000 |  |  |  |  |  |  |
Cash paid for contingent consideration |  |  |  |  |  |  |  |  |  |  |  | $ 62,000 |  |  |
Reversed the remaining contingent consideration accrual to other income |  |  |  |  |  |  |  |  |  |  |  | $ 38,000 |  |  |
Scidera Genomics, LLC |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for purchase of business |  |  |  |  |  |  | $ 3,400,000 |  |  |  |  |  |  |  |
Purchase price allocation for property and equipment |  |  |  |  |  |  | 246,000 |  |  |  |  |  |  |  |
Purchase price allocation for intangible assets |  |  |  |  |  |  | 1,570,000 |  |  |  |  |  |  |  |
Purchase price allocation for current assets |  |  |  |  |  |  | $ 35,000 |  |  |  |  |  |  |  |
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 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 | 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 |  |  |  |  |  |  |  |  |  |
Prima Tech Incorporated | Trademarks |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for non-amortizable trademarks |  |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |  |  |
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 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 property and equipment |  |  | 159,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for current liabilities |  |  | 130,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for intangible assets |  |  | 2,109,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for prepaid assets |  |  | 48,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for other receivable |  |  | 178,000 |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for long-term liabilities |  |  | $ 813,000 |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Sterling Test House | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash consideration for purchase of business | $ 1,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 property and equipment |  | 64,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase price allocation for intangible assets |  | $ 20,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Finite lived intangible assets, useful life |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |  |

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- Definition The cash outflow associated with the acquisition of business during the period. The cash portion only of the acquisition price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585 + Details
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