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Shares (Tables) | 12 Months Ended
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Mar. 31, 2013
Equity [Abstract] |
Schedule of common shares issued and outstanding | Issued and outstanding:
|  | Number of Shares |  |  | Amount |
Voting common shares |  |  |  |
Issued and outstanding at March 31, 2010 |  | 36,049,276 |  |  | $ | 303,505 |
Issued upon exercise of stock options |  | 193,250 |  |  | 963 |
Transferred from additional paid-in capital on exercise of stock options |  | — |  |  | 386 |
Issued and outstanding at March 31, 2011 |  | 36,242,526 |  |  | $ | 304,854 |
Issued upon exercise of stock options |  | 8,480 |  |  | 35 |
Transferred from additional paid-in capital on exercise of stock options |  | — |  |  | 19 |
Issued and outstanding at March 31, 2012 and 2013 |  | 36,251,006 |  |  | $ | 304,908 |
Schedule of net (loss) income per share | Net (loss) income per share
Year ended March 31, |  | 2013 |  |  | 2012 |  |  | 2011 |
Net loss from continuing operations |  | $ | (28,309 | ) |  | $ | (25,383 | ) |  | $ | (29,726 | )
Net income (loss) from discontinued operations |  | 26,846 |  |  | 4,221 |  |  | (4,924 | )
Net loss |  | $ | (1,463 | ) |  | $ | (21,162 | ) |  | $ | (34,650 | )
Weighted average number of common shares (no dilutive effect) |  | 36,251,006 |  |  | 36,249,082 |  |  | 36,119,356 |
Basic per share information (no dilutive effect) |  |  |  |  |  |
Net loss from continuing operations |  | $ | (0.78 | ) |  | $ | (0.70 | ) |  | $ | (0.82 | )
Net income (loss) from discontinued operations |  | 0.74 |  |  | 0.12 |  |  | (0.14 | )
Net loss |  | $ | (0.04 | ) |  | $ | (0.58 | ) |  | $ | (0.96 | )

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