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Commitments, Contingencies and Litigation - (Additional Information) (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Jul. 31, 2017
Jun. 30, 2017
Feb. 29, 2016
Sep. 30, 2018
Jul. 01, 2018
Mar. 31, 2018
Commitments, Contingencies And Litigation [Line Items]            
Reserves for anti-competition investigations       $ 928   $ 2,326
Provision for environmental liabilities         $ 1,082 1,109
Belgium Anti-Competition Proceeding            
Commitments, Contingencies And Litigation [Line Items]            
Penalties paid relating to anti-competition investigations     $ 1,962 1,272    
Reserves for anti-competition investigations       928   2,326
Germany Anti-Competition Proceeding            
Commitments, Contingencies And Litigation [Line Items]            
Penalties paid relating to anti-competition investigations   $ 14,811        
Reserves for anti-competition investigations       0   0
Estimate of possible loss       11,415    
Dutch Anti-Competition Proceeding            
Commitments, Contingencies And Litigation [Line Items]            
Penalties paid relating to anti-competition investigations $ 11,229          
Reserves for anti-competition investigations       $ 0   $ 0