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Business Acquisitions and Investments (Details) $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2018 | Mar. 31, 2018 USD ($) | Mar. 31, 2018 CNY (¥) | Nov. 30, 2017 USD ($) | Apr. 30, 2014 USD ($)
Foshan GWO YNG SMP Vehicle Climate Control & Cooling Products Co. Ltd. [Member] |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |
Percentage of equity interest acquired |  |  | 65.00% | 15.00% | 15.00% |  | 50.00%
Equity in joint ventures |  |  |  | $ 4.2 | ¥ 26,475,583 |  | $ 14.0
Foshan Guangdong Automotive Air Conditioning Co., Ltd [Member] |  |  |  |  |  |  |
Business Combination, Description [Abstract] |  |  |  |  |  |  |
Percentage of equity interest acquired |  |  |  |  |  | 50.00% |
Equity in joint ventures |  |  |  |  |  | $ 12.5 |
Purchase price | $ 5.7 | $ 6.8 |  |  |  |  |

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