Condensed Consolidated Statements of Operations and Other Comprehensive Income [Parenthetical] (USD $) In Thousands | 3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Sep. 30, 2011 | Sep. 30, 2010 | Sep. 30, 2011 | Sep. 30, 2010 | |
| Income tax effect of extraordinary item, gain (in dollars) | $ 0 | $ 0 | $ 0 | $ 0 |
| Income tax effect of extraordinary item, loss (in dollars) | $ 0 | $ 0 | $ 0 | $ 0 |