Accounting Estimates, Summary of Significant Accounting Policies and Recent Accounting Pronouncements (Notes)	6 Months Ended
Mar. 31, 2014
Accounting Policies [Abstract]
Accounting Estimates, Summary of Significant Accounting Policies, and Recent Accounting Prounouncements	Accounting Estimates, Summary of Significant Accounting Policies, and Recent Accounting Pronouncements Use of Estimates We prepared our consolidated financial statements in conformity with GAAP, which requires us to make estimates and assumptions affecting the amounts reported in the consolidated financial statements and accompanying notes. Changes in these estimates and assumptions may have a material impact on our consolidated financial statements and accompanying notes. Examples of estimates and assumptions include the determination of the best estimate of selling price of the deliverables included in multiple-deliverable revenue arrangements, valuing assets and liabilities acquired through business combinations, determining the fair value of acquisition-related contingent considerations, valuing and estimating useful lives of intangible assets, recognizing uncertain tax positions, estimating tax valuation allowances on tax attribute carryforwards, determining the other-than-temporary impairments for strategic investments, deferring certain revenue and costs, share-based compensation, valuing allowances for accounts receivable, estimating useful lives of property and equipment, and estimating product warranties. Actual results could differ from these estimates. Recently Adopted Accounting Guidance On July 18, 2013, the FASB issued ASU 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (a consensus of the Financial Accounting Standards Board Emerging Issues Task Force) (“ASU 2013-11”). ASU 2013-11 requires the netting of unrecognized tax benefits (“UTBs”) against a deferred tax asset for a loss or other carryforward that would apply in settlement of the uncertain tax positions. UTBs are required to be netted against all available same-jurisdiction losses or other tax carryforwards that would be utilized, rather than only against carryforwards that are created by the UTBs. ASU 2013-11 is effective for interim and annual periods beginning after December 15, 2013. We early adopted ASU 2013-11, effective October 1, 2013, on a prospective basis. The adoption did not have a significant impact on our consolidated financial statements. In February 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2013-02, Other Comprehensive Income (Topic 220), Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (“ASU 2013-02”). ASU 2013-02 requires entities to present (either on the face of the income statement or in the notes to the consolidated financial statements) the significant effects on the line items of the income statement for amounts reclassified out of accumulated other comprehensive income. We adopted ASU 2013-02 effective October 1, 2013. The adoption did not have a significant impact on our consolidated financial statements. Recent Accounting Guidance Not Yet Adopted In March 2013, the FASB issued ASU 2013-05, Foreign Currency Matters (Topic 830), Parent’s Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity (a consensus of the FASB Emerging Issues Task Force) (“ASU 2013-05”). ASU 2013-05 requires that the parent release any related cumulative translation adjustment into net income only if the sale or transfer results in the complete or substantially complete liquidation of the foreign entity in which the subsidiary or group of assets had resided. ASU 2013-05 will be effective for us beginning October 1, 2014. We do not anticipate material impacts on our consolidated financial statements upon adoption.

Accounting Estimates, Summary of Significant Accounting Policies, and Recent Accounting Pronouncements

Use of Estimates

We prepared our consolidated financial statements in conformity with GAAP, which requires us to make estimates and assumptions affecting the amounts reported in the consolidated financial statements and accompanying notes. Changes in these estimates and assumptions may have a material impact on our consolidated financial statements and accompanying notes. Examples of estimates and assumptions include the determination of the best estimate of selling price of the deliverables included in multiple-deliverable revenue arrangements, valuing assets and liabilities acquired through business combinations, determining the fair value of acquisition-related contingent considerations, valuing and estimating useful lives of intangible assets, recognizing uncertain tax positions, estimating tax valuation allowances on tax attribute carryforwards, determining the other-than-temporary impairments for strategic investments, deferring certain revenue and costs, share-based compensation, valuing allowances for accounts receivable, estimating useful lives of property and equipment, and estimating product warranties. Actual results could differ from these estimates.

Recently Adopted Accounting Guidance

On July 18, 2013, the FASB issued ASU 2013-11, Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists (a consensus of the Financial Accounting Standards Board Emerging Issues Task Force) (“ASU 2013-11”). ASU 2013-11 requires the netting of unrecognized tax benefits (“UTBs”) against a deferred tax asset for a loss or other carryforward that would apply in settlement of the uncertain tax positions. UTBs are required to be netted against all available same-jurisdiction losses or other tax carryforwards that would be utilized, rather than only against carryforwards that are created by the UTBs. ASU 2013-11 is effective for interim and annual periods beginning after December 15, 2013. We early adopted ASU 2013-11, effective October 1, 2013, on a prospective basis. The adoption did not have a significant impact on our consolidated financial statements.

In February 2013, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2013-02, Other Comprehensive Income (Topic 220), Reporting of Amounts Reclassified Out of Accumulated Other Comprehensive Income (“ASU 2013-02”). ASU 2013-02 requires entities to present (either on the face of the income statement or in the notes to the consolidated financial statements) the significant effects on the line items of the income statement for amounts reclassified out of accumulated other comprehensive income. We adopted ASU 2013-02 effective October 1, 2013. The adoption did not have a significant impact on our consolidated financial statements.

Recent Accounting Guidance Not Yet Adopted

In March 2013, the FASB issued ASU 2013-05, Foreign Currency Matters (Topic 830), Parent’s Accounting for the Cumulative Translation Adjustment upon Derecognition of Certain Subsidiaries or Groups of Assets within a Foreign Entity or of an Investment in a Foreign Entity (a consensus of the FASB Emerging Issues Task Force) (“ASU 2013-05”). ASU 2013-05 requires that the parent release any related cumulative translation adjustment into net income only if the sale or transfer results in the complete or substantially complete liquidation of the foreign entity in which the subsidiary or group of assets had resided. ASU 2013-05 will be effective for us beginning October 1, 2014. We do not anticipate material impacts on our consolidated financial statements upon adoption.