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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

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