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Income Taxes	6 Months Ended
Income Taxes	Sep. 30, 2012
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Our effective tax rate for the first six months of Fiscal 2013 was determined by excluding certain jurisdictions with net losses. As a result, the tax provision for the first six months of Fiscal 2013 was 0.3% and was due to taxable income in profitable jurisdictions. Our effective tax rate for the first six months of Fiscal 2012 was a benefit of 76.9% and was positively affected by federal and state research and experimentation credits, earnings on marketable securities that are exempt from federal income taxes, the reversal of a tax contingency due to lapse in the statute of limitations and the tax impact of income in foreign locations.

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

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+ Details