Calculation of Basic and Diluted Earnings Per Share (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
Aug. 31, 2012	Aug. 31, 2011	Aug. 31, 2010
Earnings Per Share [Line Items]
Net income attributable to Jabil Circuit, Inc.	$ 394,687	$ 381,063	$ 168,840
Weighted-average common shares outstanding	206,160	212,386	209,418
Share-based payment awards classified as participating securities		2,116	4,914
Denominator for basic earnings per share	206,160	214,502	214,332
Dilutive common shares issuable under the employee stock purchase plan and upon exercise of stock options and stock appreciation rights	315	872	215
Dilutive unvested restricted stock awards	4,706	5,345	3,050
Denominator for diluted earnings per share	211,181	220,719	217,597
Basic	$ 1.91	$ 1.78	$ 0.79
Diluted	$ 1.87	$ 1.73	$ 0.78

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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Accounting Standards Codification

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