Benefit Plans	9 Months Ended
Dec. 31, 2011
General Discussion of Pension and Other Postretirement Benefits [Abstract]
Benefit Plans	BENEFIT PLANS Historically, the Company participated in several MEPPs providing defined benefits to union employees under the terms of CBAs. Contributions were made to the plans in accordance with negotiated CBAs. The plans generally provide retirement benefits to participants based on their service to contributing employers. In connection with the renewal of CBAs, the Company has been successful in negotiating its withdrawal from MEPPs, replacing those retirement plans for CBA employees with defined contribution plans. As part of the withdrawal from a MEPP, the Company is required to fund its portion of the MEPP’s unfunded pension obligation, if any. The amount of the withdrawal liability assessed by a MEPP is impacted by a number of factors, including investment returns, benefit levels, interest rates and continued participation by other employers in the MEPPs. During the three months ended December 31, 2011, the Company incurred MEPP withdrawal charges of $3.4 million, primarily related to the final withdrawal and assessment from its last remaining MEPP. Total MEPP withdrawal charges for the nine months ended December 31, 2011 were $4.3 million. There were no MEPP charges during the three months ended December 31, 2010 and $4.6 million of MEPP charges were incurred during the nine months ended December 31, 2010. MEPP withdrawal liabilities amounted to $1.6 million at December 31, 2011 and $16.0 million at March 31, 2011. The Company has successfully negotiated its withdrawal from all MEPPs in which it previously participated and has fully accrued for the related withdrawal assessments.

Benefit Plans

9 Months Ended

Dec. 31, 2011

General Discussion of Pension and Other Postretirement Benefits [Abstract]

BENEFIT PLANS

Historically, the Company participated in several MEPPs providing defined benefits to union employees under the terms of CBAs. Contributions were made to the plans in accordance with negotiated CBAs. The plans generally provide retirement benefits to participants based on their service to contributing employers.

In connection with the renewal of CBAs, the Company has been successful in negotiating its withdrawal from MEPPs, replacing those retirement plans for CBA employees with defined contribution plans. As part of the withdrawal from a MEPP, the Company is required to fund its portion of the MEPP’s unfunded pension obligation, if any. The amount of the withdrawal liability assessed by a MEPP is impacted by a number of factors, including investment returns, benefit levels, interest rates and continued participation by other employers in the MEPPs.

During the three months ended December 31, 2011, the Company incurred MEPP withdrawal charges of $3.4 million, primarily related to the final withdrawal and assessment from its last remaining MEPP. Total MEPP withdrawal charges for the nine months ended December 31, 2011 were $4.3 million. There were no MEPP charges during the three months ended December 31, 2010 and $4.6 million of MEPP charges were incurred during the nine months ended December 31, 2010. MEPP withdrawal liabilities amounted to $1.6 million at December 31, 2011 and $16.0 million at March 31, 2011. The Company has successfully negotiated its withdrawal from all MEPPs in which it previously participated and has fully accrued for the related withdrawal assessments.