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Business and Product Line Acquisitions - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended
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
Aug. 31, 2015
Aug. 31, 2014
Business Acquisition [Line Items]                        
Reversed the remaining contingent consideration accrual to other income                     $ 0 $ 241,000
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          
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 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                        
Business Acquisition [Line Items]                        
Cash consideration for purchase of business   $ 1,118,000                    
Purchase price allocation for accounts receivable   43,000                    
Purchase price allocation for inventory   14,000                    
Purchase price allocation for property and equipment   $ 141,000                    
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                  
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 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