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Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Jun. 30, 2017
Property, Plant and Equipment    
Property, plant and equipment gross $ 372,955 $ 352,010
Accumulated depreciation (205,672) (192,280)
Land 16,218 16,336
Property, plant and equipment, net 183,501 176,066
Building and Facilities    
Property, Plant and Equipment    
Property, plant and equipment gross 108,515 108,682
Machinery and Equipment    
Property, Plant and Equipment    
Property, plant and equipment gross 224,993 201,236
Equipment under Capital Leases | Northlake, Texas    
Property, Plant and Equipment    
Property, plant and equipment gross 2,486 7,540
Capitalized Software Costs | Northlake, Texas    
Property, Plant and Equipment    
Property, plant and equipment gross 23,611 21,794
Office furniture and equipment    
Property, Plant and Equipment    
Property, plant and equipment gross $ 13,350 $ 12,758