Unaudited Interim Information	3 Months Ended
Dec. 31, 2014
Quarterly Financial Information Disclosure [Abstract]
Unaudited Interim Information	UNAUDITED INTERIM INFORMATION The accompanying unaudited condensed consolidated financial statements of Atwood Oceanics, Inc. and its subsidiaries as of December 31, 2014 and for the three months ended December 31, 2014 and 2013, have been prepared in accordance with accounting principles generally accepted in the U.S. for interim financial information. Unless otherwise indicated, references to “we”, “us”, “our” and the “Company” refer collectively to Atwood Oceanics, Inc. and subsidiaries. The year-end condensed consolidated balance sheet data was derived from the audited financial statements as of September 30, 2014. Although these financial statements and related information have been prepared without audit and certain information and note disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles have been condensed or omitted, we believe that the note disclosures are adequate to make the information not misleading. The interim financial results may not be indicative of results that could be expected for a full fiscal year. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the related notes included in our Annual Report on Form 10-K for the year ended September 30, 2014. In our opinion, the unaudited interim financial statements reflect all adjustments considered necessary for a fair statement of our financial position, results of operations and cash flows for the periods presented. Certain prior period amounts have been reclassified to conform to current year presentation. Recently issued accounting pronouncements In April 2014, the Financial Accounting Standards Board (“FASB”) issued new guidance intended to change the criteria for reporting discontinued operations while enhancing disclosures for discontinued operations, which changes the criteria and requires additional disclosures for reporting discontinued operations. The guidance is effective for all disposals of components of an entity that occur within annual periods beginning on or after December 15, 2014, and interim periods within annual periods beginning on or after December 15, 2015. We do not expect that our adoption will have a material impact on our financial statements or disclosures in our financial statements. In May 2014, the FASB issued new guidance intended to change the criteria for recognition of revenue. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve this core principle, an entity should apply the following five steps: (1) Identify contracts with customers, (2) Identify the performance obligations in the contracts, (3) Determine the transaction price, (4) Allocate the transaction price to the performance obligation in the contract, and (5) Recognize revenue as the entity satisfies performance obligations. The guidance is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. Early application is not permitted. We are currently evaluating what impact the adoption of this guidance will have on our financial statements or disclosures in our financial statements. In June 2014, the FASB issued amended guidance on the accounting for certain share-based employee compensation awards. The amended guidance applies to share-based employee compensation awards that include a performance target that affects vesting when the performance target can be achieved after the requisite service period. These targets are to be treated as a performance condition. As such, the performance target should not be reflected in estimating the grant-date fair value of the award and compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved. The amendments are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. We do not expect that our adoption will have a material impact on our financial statements or disclosures in our financial statements. In August 2014, the FASB issued guidance on disclosures of uncertainties about an entity's ability to continue as a going concern. The guidance requires management's evaluation of whether there are conditions or events that raise substantial doubt about the entity's ability to continue as a going concern within one year after the date that the financial statements are issued. This assessment must be made in connection with preparing financial statements for each annual and interim reporting period. Management's evaluation should be based on the relevant conditions and events that are known and reasonably knowable at the date the financial statements are issued. If conditions or events raise substantial doubt about the entity's ability to continue as a going concern, but this doubt is alleviated by management's plans, the entity should disclose information that enables the reader to understand what the conditions or events are, management's evaluation of those conditions or events and management's plans that alleviate that substantial doubt. If conditions or events raise substantial doubt and the substantial doubt is not alleviated, the entity must disclose this in the footnotes. The entity must also disclose information that enables the reader to understand what the conditions or events are, management's evaluation of those conditions or events and management's plans that are intended to alleviate that substantial doubt. The guidance is effective for annual periods and interim periods within those annual periods beginning after December 15, 2016. We do not expect that our adoption will have a material impact on our financial statements or disclosures in our financial statements.

UNAUDITED INTERIM INFORMATION

The accompanying unaudited condensed consolidated financial statements of Atwood Oceanics, Inc. and its subsidiaries as of December 31, 2014 and for the three months ended December 31, 2014 and 2013, have been prepared in accordance with accounting principles generally accepted in the U.S. for interim financial information. Unless otherwise indicated, references to “we”, “us”, “our” and the “Company” refer collectively to Atwood Oceanics, Inc. and subsidiaries. The year-end condensed consolidated balance sheet data was derived from the audited financial statements as of September 30, 2014. Although these financial statements and related information have been prepared without audit and certain information and note disclosures normally included in financial statements prepared in accordance with generally accepted accounting principles have been condensed or omitted, we believe that the note disclosures are adequate to make the information not misleading. The interim financial results may not be indicative of results that could be expected for a full fiscal year. These unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the related notes included in our Annual Report on Form 10-K for the year ended September 30, 2014. In our opinion, the unaudited interim financial statements reflect all adjustments considered necessary for a fair statement of our financial position, results of operations and cash flows for the periods presented. Certain prior period amounts have been reclassified to conform to current year presentation.

Recently issued accounting pronouncements

In April 2014, the Financial Accounting Standards Board (“FASB”) issued new guidance intended to change the criteria for reporting discontinued operations while enhancing disclosures for discontinued operations, which changes the criteria and requires additional disclosures for reporting discontinued operations. The guidance is effective for all disposals of components of an entity that occur within annual periods beginning on or after December 15, 2014, and interim periods within annual periods beginning on or after December 15, 2015. We do not expect that our adoption will have a material impact on our financial statements or disclosures in our financial statements.

In May 2014, the FASB issued new guidance intended to change the criteria for recognition of revenue. The core principle of the guidance is that an entity should recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. To achieve this core principle, an entity should apply the following five steps: (1) Identify contracts with customers, (2) Identify the performance obligations in the contracts, (3) Determine the transaction price, (4) Allocate the transaction price to the performance obligation in the contract, and (5) Recognize revenue as the entity satisfies performance obligations. The guidance is effective for annual reporting periods beginning after December 15, 2016, including interim periods within that reporting period. Early application is not permitted. We are currently evaluating what impact the adoption of this guidance will have on our financial statements or disclosures in our financial statements.

In June 2014, the FASB issued amended guidance on the accounting for certain share-based employee compensation awards. The amended guidance applies to share-based employee compensation awards that include a performance target that affects vesting when the performance target can be achieved after the requisite service period. These targets are to be treated as a performance condition. As such, the performance target should not be reflected in estimating the grant-date fair value of the award and compensation cost should be recognized in the period in which it becomes probable that the performance target will be achieved. The amendments are effective for annual periods and interim periods within those annual periods beginning after December 15, 2015. We do not expect that our adoption will have a material impact on our financial statements or disclosures in our financial statements.

In August 2014, the FASB issued guidance on disclosures of uncertainties about an entity's ability to continue as a going concern. The guidance requires management's evaluation of whether there are conditions or events that raise substantial doubt about the entity's ability to continue as a going concern within one year after the date that the financial statements are issued. This assessment must be made in connection with preparing financial statements for each annual and interim reporting period. Management's evaluation should be based on the relevant conditions and events that are known and reasonably knowable at the date the financial statements are issued. If conditions or events raise substantial doubt about the entity's ability to continue as a going concern, but this doubt is alleviated by management's plans, the entity should disclose information that enables the reader to understand what the conditions or events are, management's evaluation of those conditions or events and management's plans that alleviate that substantial doubt. If conditions or events raise substantial doubt and the substantial doubt is not alleviated, the entity must disclose this in the footnotes. The entity must also disclose information that enables the reader to understand what the conditions or events are, management's evaluation of those conditions or events and management's plans that are intended to alleviate that substantial doubt. The guidance is effective for annual periods and interim periods within those annual periods beginning after December 15, 2016. We do not expect that our adoption will have a material impact on our financial statements or disclosures in our financial statements.