Net Income (Loss) Per Share Reconciliation of the shares used for the basic earnings (loss) per share (“EPS”) and diluted EPS calculations (Details)	3 Months Ended				6 Months Ended
	Sep. 30, 2012		Sep. 30, 2011		Sep. 30, 2012		Sep. 30, 2011
Basic EPS:
Weighted average number of shares of common stock outstanding and vested deferred stock units (“DSUs”) (in shares)	11,669,000	[1]	11,149,000	[1]	11,451,000	[1]	11,257,000	[1]
Diluted EPS:
Effect of dilutive stock options and unvested DSUs (in shares)	0		0		0		166,000
Total diluted EPS (in shares)	11,669,000		11,149,000		11,451,000		11,423,000
Stock Options [Member]
Diluted EPS:
Total outstanding options not included in diluted EPS as they would be antidilutive (in shares)	2,885,000		1,715,000		2,885,000		918,000
Performance Shares [Member]
Diluted EPS:
Performance-based grants not included in diluted EPS (in shares)	270,000		326,000		270,000		318,000
Deferred Stock Unit (DSU) [Member]
Diluted EPS:
Vested stock units (in shares)	139,436		82,164		132,442		76,576

[1] Includes 139,436 and 82,164 vested cumulative DSUs, respectively, for the three months ended September 30, 2012 and 2011 and 132,442 and 76,576 vested cumulative DSUs, respectively, for the six months ended September 30, 2012 and 2011 that will not be issued until the directors holding the DSUs retire from our Board of Directors.