Income Tax	6 Months Ended
Sep. 30, 2012
Income Tax Disclosure [Abstract]
Income Tax	Income Tax The provision for income taxes for the three months ended September 30, 2012 and 2011 was approximately $8.8 million and $11.0 million, respectively. The effective tax rates were 36.0% and 34.9% for the three months ended September 30, 2012 and 2011, respectively. The effective tax rate increased as compared to the same prior year period due to the expiration of the federal research and development income tax credit statute which expired on December 31, 2011 and is therefore not included in the current year provision. In addition, there were net benefits from the reduced state effective tax rate offset by decreased benefit from stock based compensation. The provision for income taxes for the six months ended September 30, 2012 and 2011 was approximately $16.6 million and $20.9 million, respectively. The effective tax rates were 34.8% and 34.6% for the six months ended September 30, 2012 and 2011, respectively. The effective tax rate increased as compared to the same prior year period primarily due to the factors mentioned in the quarter-to-date discussion above. Uncertain tax positions As of September 30, 2012, the Company has provided a liability of $563 for unrecognized tax benefits related to various federal and state income tax matters. If recognized, $563 would impact the Company’s effective tax rate. The liability for the six months ended September 30, 2012 decreased from the same prior year period by $79 due to additional state income tax contingent liability reserve and the expiration of the statute of limitations of prior year tax positions of acquired companies. The Company's income tax returns filed for tax years 2009 through 2011 and 2008 through 2011 are subject to examination by the federal and state taxing authorities, respectively. The Company is currently under examination by the IRS and by four state income tax authorities. The Company does not anticipate that total unrecognized tax benefits will significantly change due to the settlement of audits or the expiration of statute of limitations within the next twelve months.

Income Tax

6 Months Ended

Sep. 30, 2012

The provision for income taxes for the three months ended September 30, 2012 and 2011 was approximately $8.8 million and $11.0 million, respectively. The effective tax rates were 36.0% and 34.9% for the three months ended September 30, 2012 and 2011, respectively. The effective tax rate increased as compared to the same prior year period due to the expiration of the federal research and development income tax credit statute which expired on December 31, 2011 and is therefore not included in the current year provision. In addition, there were net benefits from the reduced state effective tax rate offset by decreased benefit from stock based compensation.

The provision for income taxes for the six months ended September 30, 2012 and 2011 was approximately $16.6 million and $20.9 million, respectively. The effective tax rates were 34.8% and 34.6% for the six months ended September 30, 2012 and 2011, respectively. The effective tax rate increased as compared to the same prior year period primarily due to the factors mentioned in the quarter-to-date discussion above.

Uncertain tax positions

As of September 30, 2012, the Company has provided a liability of $563 for unrecognized tax benefits related to various federal and state income tax matters. If recognized, $563 would impact the Company’s effective tax rate. The liability for the six months ended September 30, 2012 decreased from the same prior year period by $79 due to additional state income tax contingent liability reserve and the expiration of the statute of limitations of prior year tax positions of acquired companies.

The Company's income tax returns filed for tax years 2009 through 2011 and 2008 through 2011 are subject to examination by the federal and state taxing authorities, respectively. The Company is currently under examination by the IRS and by four state income tax authorities. The Company does not anticipate that total unrecognized tax benefits will significantly change due to the settlement of audits or the expiration of statute of limitations within the next twelve months.