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Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Basic Earnings Per Share [Abstract] |  |  |  |
(Loss) earnings from continuing operations | $ (11,848) | $ 1,000 | $ (12,903) | $ 13,566
Less: Net earnings attributable to noncontrolling interest | (267) | (38) | (568) | (29)
(Loss) earnings from continuing operations attributable to Modine | (12,115) | 962 | (13,471) | 13,537
Less: Undistributed earnings attributable to unvested shares | 0 | (3) | 0 | (51)
Net (loss) earnings from continuing operations available to Modine shareholders | (12,115) | 959 | (13,471) | 13,486
Net (loss) earnings from discontinued operations | (105) | 373 | 72 | 373
Less: Undistributed earnings attributable to unvested shares | 0 | (1) | (1) | (1)
Net (loss) earnings from discontinued operations available to Modine shareholders | (105) | 372 | 71 | 372
Net (loss) earnings available to Modine shareholders | (12,220) | 1,331 | (13,400) | 13,858
Weighted average shares outstanding - basic (in shares) | 46,584 | 46,477 | 46,565 | 46,419
(Loss) earnings from continuing operations per share (in dollars per share) | $ (0.26) | $ 0.02 | $ (0.29) | $ 0.29
Net earnings from discontinued operations per share (in dollars per share) | $ 0 | $ 0.01 | $ 0 | $ 0.01
Net (loss) earnings per share - basic (in dollars per share) | $ (0.26) | $ 0.03 | $ (0.29) | $ 0.30
Diluted Earnings Per Share [Abstract] |  |  |  |
(Loss) earnings from continuing operations | (11,848) | 1,000 | (12,903) | 13,566
Less: Net earnings attributable to noncontrolling interest | (267) | (38) | (568) | (29)
(Loss) earnings from continuing operations attributable to Modine | (12,115) | 962 | (13,471) | 13,537
Less: Undistributed earnings attributable to unvested shares | 0 | (4) | 0 | (35)
Net (loss) earnings from continuing operations available to Modine shareholders | (12,115) | 958 | (13,471) | 13,502
Net (loss) earnings from discontinued operations | (105) | 373 | 72 | 373
Less: Undistributed earnings attributable to unvested shares | 0 | (1) | (1) | (1)
Net (loss) earnings from discontinued operations available to Modine shareholders | (105) | 372 | 71 | 372
Net (loss) earnings available to Modine shareholders | $ (12,220) | $ 1,330 | $ (13,400) | $ 13,874
Weighted average shares outstanding - basic (in shares) | 46,584 | 46,477 | 46,565 | 46,419
Effect of dilutive securities (in shares) | 0 | 381 | 0 | 500
Weighted average shares outstanding - diluted (in shares) | 46,584 | 46,858 | 46,565 | 46,919
(Loss) earnings from continuing operations per share (in dollars per share) | $ (0.26) | $ 0.02 | $ (0.29) | $ 0.29
Net earnings from discontinued operations per share (in dollars per share) | $ 0 | $ 0.01 | $ 0 | $ 0.01
Net (loss) earnings per share - diluted (in dollars per share) | $ (0.26) | $ 0.03 | $ (0.29) | $ 0.30
Potential dilutive securities | 228 |  | 282 |
Stock Options [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from computation of earning per share (in shares) | 1,273 | 1,497 | 1,273 | 1,497
Restricted Stock [Member] |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |
Antidilutive securities excluded from computation of earning per share (in shares) | 146 | 189 | 131 | 189

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