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Acquisitions - Schedule of Recognized Identified Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Business Combination Separately Recognized Transactions [Line Items]          
Goodwill $ 2,321,180   $ 1,251,986 $ 1,256,014 $ 1,197,565
Allied Acquisition [Member]          
Business Combination Separately Recognized Transactions [Line Items]          
Cash 169 $ 19,322      
Accounts receivable 322,962 315,485      
Inventory 314,658 322,705      
Prepaid and other current assets 75,144 59,279      
Property, plant, and equipment 139,360 139,528      
Goodwill 1,069,498 1,130,635      
Intangible assets 1,047,000 1,037,000      
Current liabilities (253,048) (271,252)      
Non-current liabilities (2,645) (6,820)      
Total purchase price 2,713,098 $ 2,745,882      
Cash (19,153)        
Accounts receivable 7,477        
Inventory (8,047)        
Prepaid and other current assets 15,865        
Property, plant, and equipment (168)        
Goodwill (61,137)        
Intangible assets 10,000        
Current liabilities 18,204        
Non-current liabilities 4,175        
Total purchase price $ (32,784)