Stock-Based Compensation (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option term	10 years
Assumptions for stock options granted [Abstract]
Weighted average fair value of options (in dollars per share)	$ 4.26	$ 10.45	$ 6.43
Expected life of awards in years	6 years 3 months 18 days	6 years 3 months 18 days	6 years 3 months 18 days
Risk-free interest rate (in hundredths)	0.90%	1.90%	2.40%
Expected volatility of the Company's stock (in hundredths)	87.40%	79.60%	78.00%
Expected dividend yield on the Company's stock (in hundredths)	0.00%	0.00%	0.00%
Vesting percentage at grant date (in hundredths)	25.00%
Annual vesting percentage (in hundredths)	25.00%
Pre-vesting forfeiture rate (in hundredths)	2.50%
Compensation Expense [Abstract]
Compensation expense	$ 1.1	$ 1.3	$ 1.6
Total fair value of stock options vesting	1.3
Unrecognized compensation costs	1.0
Weighted average period recognized	1 year 8 months 12 days
Shares [Rollforward]
Outstanding, April 1 (in shares)	1.8
Granted (in shares)	0.2
Exercised (in shares)	0
Forfeited or expired (in shares)	(0.3)
Outstanding, March 31 (in shares)	1.7	1.8
Exercisable, March 31 (in shares)	1.5
Weighted average exercise price [Rollforward]
Outstanding, April 1 (in dollars per share)	$ 16.37
Granted (in dollars per share)	$ 5.79
Exercised (in dollars per share)	$ 5.01
Forfeited or expired (in dollars per share)	$ 21.78
Outstanding, March 31 (in dollars per share)	$ 14.03	$ 16.37
Exercisable, March 31 (in dollars per share)	$ 15.15
Options, Outstanding, Weighted average remaining contractual term	5 years 7 months 6 days
Options, Outstanding, Aggregate intrinsic value	2.6
Options, Exercisable, Weighted average remaining contractual term	5 years
Options, Exercisable, Aggregate intrinsic value	2.0
Additional information related to stock options exercised during the years [Abstract]
Intrinsic value of stock options exercised	0.1	0.2	0.7
Proceeds from stock options exercised	0.1	0.5	1.5
Restricted Stock [Member]
Compensation Expense [Abstract]
Compensation expense	1.8	1.1	1.0
Unrecognized compensation costs	2.8
Weighted average period recognized	2 years 9 months 18 days
Restricted Stock Activity, Number of Shares [Roll Forward]
Non-vested balance, April 1 (in shares)	0.2
Granted (in shares)	0.5
Vested (in shares)	(0.2)
Non-vested balance, March 31 (in shares)	0.5	0.2
Weighted average price [Rollforward]
Non-vested balance, April 1 (in dollars per share)	$ 8.49
Granted (in dollars per share)	$ 6.07
Vested (in dollars per share)	$ 6.77
Non-vested balance, March 31 (in dollars per share)	$ 6.91	$ 8.49
Restricted stock - Performance Based [Member]
Compensation Expense [Abstract]
Compensation expense	0.2	(0.8)	1.4
Unrecognized compensation costs	$ 1.0
Weighted average period recognized	2 years
Restricted Stock - Performance-Based Shares [Abstract]
Award performance period	3 years
2008 Incentive Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)	2.5

Annual vesting percentage of stock options.

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Expiration period of stock options.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average price at which grantees can acquire the shares reserved for issuance on stock options awarded.

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Number of share options (or share units) exercised during the current period.

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