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Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2012 Modine Thermal Systems (Changzhou) Co. Ltd [Member] | Jun. 30, 2012 Customer Concentration Risk [Member] | Mar. 31, 2012 Customer Concentration Risk [Member]
Concentration Risk [Line Items] |  |  |
Concentration Risk Percentage 2 (in hundredths) |  | 52.00% | 54.00%
Total bad debt write-offs to trade receivables outstanding (in hundredths) |  | 1.00% |
Related Party Transaction Line Items |  |  |
Number of loans to related parties | 2 |  |
Loans related parties | $ 12,000 |  |
Maturity date | Jul. 31, 2013 |  |

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