Income Taxes	9 Months Ended
May 31, 2013
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes We determine our interim income tax provision by estimating our effective income tax rate expected to be applicable for the full fiscal year. Our effective income tax rate is dependent upon several factors, such as tax rates in state and foreign jurisdictions and the relative amount of income we earn in such jurisdictions. In determining our full year estimate, we do not include the estimated impact of unusual and/or infrequent items, which may cause significant variations in the customary relationship between income tax expense and income before income taxes. We exercise significant judgment in determining our income tax provision due to transactions, credits and calculations where the ultimate tax determination is uncertain. Our federal income tax returns for fiscal years 2006 through 2008 and 2011 are under review by the Internal Revenue Service (“IRS”). During the first quarter of fiscal year 2013, the IRS completed its audit of our federal income tax returns for fiscal years 2009 and 2010 without significant adjustment. We are subject to numerous ongoing audits, including those noted above, by federal, state, local and foreign tax authorities. Although we believe our tax accruals are reasonable, the final determination of tax audits in the U.S. or abroad and any related litigation could result in tax liabilities that materially differ from our historical income tax provisions and accruals.

Income Taxes

9 Months Ended

May 31, 2013

We determine our interim income tax provision by estimating our effective income tax rate expected to be applicable for the full fiscal year. Our effective income tax rate is dependent upon several factors, such as tax rates in state and foreign jurisdictions and the relative amount of income we earn in such jurisdictions. In determining our full year estimate, we do not include the estimated impact of unusual and/or infrequent items, which may cause significant variations in the customary relationship between income tax expense and income before income taxes. We exercise significant judgment in determining our income tax provision due to transactions, credits and calculations where the ultimate tax determination is uncertain.

Our federal income tax returns for fiscal years 2006 through 2008 and 2011 are under review by the Internal Revenue Service (“IRS”). During the first quarter of fiscal year 2013, the IRS completed its audit of our federal income tax returns for fiscal years 2009 and 2010 without significant adjustment.

We are subject to numerous ongoing audits, including those noted above, by federal, state, local and foreign tax authorities. Although we believe our tax accruals are reasonable, the final determination of tax audits in the U.S. or abroad and any related litigation could result in tax liabilities that materially differ from our historical income tax provisions and accruals.