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Property, Plant and Equipment - Summary of Property, Plant and Equipment (Detail) - USD ($)
$ in Thousands
Aug. 31, 2015
May. 31, 2015
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 244,623 $ 219,050
Accumulated depreciation and amortization (125,661) (121,124)
Property, plant and equipment, net 118,962 97,926
Land [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 3,140 3,025
Buildings and leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 29,379 27,390
Machinery and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 169,286 154,891
Furniture and fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 6,476 5,939
Capitalized ERP system development costs [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 18,616 14,524
Computers and computer software [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 7,863 7,252
Automobiles [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross 5,127 3,095
Construction in progress [Member]    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Gross $ 4,736 $ 2,934