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Acquisitions - Summary of Preliminary Purchase Price Allocation (Detail) - USD ($)
$ in Thousands
Nov. 30, 2015
Jul. 07, 2015
May. 31, 2015
Business Acquisition [Line Items]      
Goodwill $ 253,677   $ 107,773
Qualspec Group [Member]      
Business Acquisition [Line Items]      
Cash and cash equivalents   $ 3,981  
Accounts receivable   20,445  
Current deferred tax assets   279  
Prepaid expenses   1,049  
Plant, property and equipment   15,472  
Intangible assets   74,700  
Goodwill   145,440  
Non-current deferred tax assets   3,459  
Other assets   147  
Total assets acquired   264,972  
Accounts payable   2,892  
Other accrued liabilities   6,448  
Total liabilities assumed   9,340  
Net assets acquired   $ 255,632