Conversion from IFRS to GAAP	12 Months Ended
Jun. 30, 2023
Accounting Changes and Error Corrections [Abstract]
Conversion from IFRS to GAAP	Conversion from IFRS to GAAP As part of the U.S. Domestication, the Company has retrospectively converted its Consolidated Financial Statements from International Financial Reporting Standards (“IFRS”) to GAAP. Refer to Note 1, “Description of Business” for additional details. The significant differences between IFRS and GAAP as they relate to these financial statements are as follows: (a) Stock-based Compensation Under IFRS, prior to the adoption of GAAP, the Company adhered to the accelerated method of expense recognition for stock-based compensation subject to graded vesting. The application of this accounting method results in more of the grant’s stock-based compensation expense being recognized in the earlier years of the grant. Under GAAP, the Company accounts for stock-based awards using the straight-line expense method, recognizing the expense ratably over the service period which is generally four years. This change in the timing of the expense recognition is the primary driver for the GAAP transition differences. (b) Leases Under IFRS, prior to the adoption of GAAP, the Company, as lessee, applied the single lease model that is similar to the accounting for a finance lease under GAAP. The expense recognition presented a higher portion of the total expense earlier in the term as a combination of straight-line depreciation of the right-of-use asset and the effective interest rate method applied to the lease liability results in a decreasing rate of interest expense recognition throughout the lease term. Under GAAP, there is dual classification lease accounting model for lessees: finance leases and operating leases. The Company, as lessee, classified all its leases as operating leases and recognizes a single lease expense, including both a right-of-use asset depreciation component and an interest expense component, on a straight-line basis throughout the lease term. (c) Strategic Investments The Company invests in equity securities of public and private companies in which the Company does not have a controlling interest or significant influence. Under IFRS, the movement in the valuation of these investments had been recorded in other comprehensive income. Under GAAP, the Company records any impairment of these equity investments, as well as any changes in value resulting from observable price changes as a result of orderly transactions for identical or similar investments of the same issuer, in the consolidated statements of operations. This change in classification is the primary driver of the GAAP transition differences. (d) Exchangeable Senior Notes In 2018, Atlassian US, Inc. issued $1 billion in aggregate principal amount of the exchangeable senior notes (the “Notes”) due on May 1, 2023. The Notes were senior, unsecured obligations of the Company, and were scheduled to mature on May 1, 2023, unless earlier exchanged, redeemed or repurchased. The Notes were fully redeemed by the Company in fiscal year 2022. The exchange feature of the Notes required bifurcation from the Notes and was accounted for as a derivative liability. The fair value of the Notes’ embedded exchange derivative at the time of issuance was $177.9 million and was recorded as original debt discount for purposes of accounting for the debt component of the Notes. This discount was amortized as interest expense using the effective interest rate method over the term of the Notes. Under IFRS, the Company determined the effective interest rate using estimated cash flows, based on the anticipated timing on cash inflows and outflows. Under GAAP, the Company has calculated the effective interest rate using contractual cash flows, focusing on the flow of funds as determined by contractual arrangements. This change in calculation of the effective interest rate is the primary driver of the GAAP transition differences. (e) Income Taxes Prior to the adoption of GAAP, the Company accounted for income taxes pursuant to International Accounting Standard 12 Income Taxes (“IAS 12”), International Financial Reporting Interpretations Committee 23 Uncertainty over Income Tax Treatments (“IFRIC 23”) and International Accounting Standard 34 Interim Reporting. Upon the adoption of GAAP, the Company now accounts for income taxes pursuant to ASC 740 as noted below: i.Deferred Tax Deferred tax has been adjusted to remove any backwards tracing components that are permitted under IAS 12 and prohibited under ASC 740. Specifically, backwards tracing is prohibited with regard to adjustments to the beginning of the year balance of a valuation allowance because of a change in judgement about the realizability of related deferred tax assets in future years. Deferred tax liabilities and assets for investments in subsidiaries, partnerships, corporate ventures, and other entities have been assessed based on the criteria in ASC 740 rather than IAS 12. Where applicable, the Company has adopted the exception criteria in establishing whether a deferred tax asset or liability is required to be recognized. The Company acknowledges that a deferred tax asset or liability will be recognized for any investments that are not subject to the exception criteria. Under IFRS, when assessing the recognition of deferred taxes on outside basis differences between the carrying amount of an investment for financial reporting purposes and the underlying tax basis in that investment, the Company had adopted the exceptions in IAS 12 such that no deferred tax assets or liabilities had been recorded on outside basis differences that exist for any controlled subsidiaries. Under GAAP, the Company is required to recognize deferred taxes attributable to outside basis interests in equity accounted investments in addition to fiscally transparent entities such as partnerships and trusts. On that basis, the Company has recorded deferred taxes for the U.S. group’s interest in foreign and domestic fiscally transparent entities, and it is expected to recognize deferred taxes in respect of any equity accounted associate investments that it does not control. ii.Valuation Allowance The realizability of deferred tax assets was considered under GAAP and the determination to maintain a full valuation allowance in the United States and Australia was made. This is a substantially similar result under IFRS. For footnote presentation purposes, all deferred tax assets, liabilities, and valuation allowances are now reported on gross basis rather than a net basis. iii.Uncertain Tax Positions The Company recognizes and measures any uncertain tax positions in accordance with ASC 740 rather than IFRIC 23. Accordingly, the Company recognizes, and measures uncertain tax positions based on a two-step process outlined in the Income Tax section of Critical Accounting Policies. iv.Stock-Based Compensation Under IFRS, the measurement of the stock-based compensation deferred tax asset is based on an estimate of the future tax deduction based on the current stock price at each reporting period. When the expected tax benefits from equity awards exceed the recorded cumulative recognized expense multiplied by the tax rate, the tax benefit up to the amount of the tax effect of the cumulative book compensation expense is recorded in the consolidated statement of operations; the excess is recorded in equity. When the expected tax benefit is less than the tax effect of the cumulative amount of recognized expense, the entire tax benefit is recorded in the consolidated statement of operations. Under GAAP, the Company measures the stock-based compensation deferred tax asset based on the amount of compensation cost recognized for financial statement purposes. Changes in stock price do not result in a remeasurement of the related deferred tax asset. Upon settlement or expiration, excess tax benefits and tax deficiencies are recognized within the provisions for income taxes. v.Other Pre-tax Changes The tax effects resulting from other accounting changes to pre-tax income, including leases, strategic investments, and notes, are included in the tax provision under GAAP.

As part of the U.S. Domestication, the Company has retrospectively converted its Consolidated Financial Statements from International Financial Reporting Standards (“IFRS”) to GAAP. Refer to Note 1, “Description of Business” for additional details.

Under IFRS, prior to the adoption of GAAP, the Company adhered to the accelerated method of expense recognition for stock-based compensation subject to graded vesting. The application of this accounting method results in more of the grant’s stock-based compensation expense being recognized in the earlier years of the grant.

Under GAAP, the Company accounts for stock-based awards using the straight-line expense method, recognizing the expense ratably over the service period which is generally four years. This change in the timing of the expense recognition is the primary driver for the GAAP transition differences.

Under IFRS, prior to the adoption of GAAP, the Company, as lessee, applied the single lease model that is similar to the accounting for a finance lease under GAAP. The expense recognition presented a higher portion of the total expense earlier in the term as a combination of straight-line depreciation of the right-of-use asset and the effective interest rate method applied to the lease liability results in a decreasing rate of interest expense recognition throughout the lease term.

Under GAAP, there is dual classification lease accounting model for lessees: finance leases and operating leases. The Company, as lessee, classified all its leases as operating leases and recognizes a single lease expense, including both a right-of-use asset depreciation component and an interest expense component, on a straight-line basis throughout the lease term.

The Company invests in equity securities of public and private companies in which the Company does not have a controlling interest or significant influence. Under IFRS, the movement in the valuation of these investments had been recorded in other comprehensive income. Under GAAP, the Company records any impairment of these equity investments, as well as any changes in value resulting from observable price changes as a result of orderly transactions for identical or similar investments of the same issuer, in the consolidated statements of operations. This change in classification is the primary driver of the GAAP transition differences.

In 2018, Atlassian US, Inc. issued $1 billion in aggregate principal amount of the exchangeable senior notes (the “Notes”) due on May 1, 2023. The Notes were senior, unsecured obligations of the Company, and were scheduled to mature on May 1, 2023, unless earlier exchanged, redeemed or repurchased. The Notes were fully redeemed by the Company in fiscal year 2022.

The exchange feature of the Notes required bifurcation from the Notes and was accounted for as a derivative liability. The fair value of the Notes’ embedded exchange derivative at the time of issuance was $177.9 million and was recorded as original debt discount for purposes of accounting for the debt component of the Notes. This discount was amortized as interest expense using the effective interest rate method over the term of the Notes.

Under IFRS, the Company determined the effective interest rate using estimated cash flows, based on the anticipated timing on cash inflows and outflows. Under GAAP, the Company has calculated the effective interest rate using contractual cash flows, focusing on the flow of funds as determined by contractual arrangements. This change in calculation of the effective interest rate is the primary driver of the GAAP transition differences.

Prior to the adoption of GAAP, the Company accounted for income taxes pursuant to International Accounting Standard 12 Income Taxes (“IAS 12”), International Financial Reporting Interpretations Committee 23 Uncertainty over Income Tax Treatments (“IFRIC 23”) and International Accounting Standard 34 Interim Reporting. Upon the adoption of GAAP, the Company now accounts for income taxes pursuant to ASC 740 as noted below:

Deferred tax has been adjusted to remove any backwards tracing components that are permitted under IAS 12 and prohibited under ASC 740. Specifically, backwards tracing is prohibited with regard to adjustments to the beginning of the year balance of a valuation allowance because of a change in judgement about the realizability of related deferred tax assets in future years.

Deferred tax liabilities and assets for investments in subsidiaries, partnerships, corporate ventures, and other entities have been assessed based on the criteria in ASC 740 rather than IAS 12. Where applicable, the Company has adopted the exception criteria in establishing whether a deferred tax asset or liability is required to be recognized. The Company acknowledges that a deferred tax asset or liability will be recognized for any investments that are not subject to the exception criteria.

Under IFRS, when assessing the recognition of deferred taxes on outside basis differences between the carrying amount of an investment for financial reporting purposes and the underlying tax basis in that investment, the Company had adopted the exceptions in IAS 12 such that no deferred tax assets or liabilities had been recorded on outside basis differences that exist for any controlled subsidiaries.

Under GAAP, the Company is required to recognize deferred taxes attributable to outside basis interests in equity accounted investments in addition to fiscally transparent entities such as partnerships and trusts. On that basis, the Company has recorded deferred taxes for the U.S. group’s interest in foreign and domestic fiscally transparent entities, and it is expected to recognize deferred taxes in respect of any equity accounted associate investments that it does not control.

The realizability of deferred tax assets was considered under GAAP and the determination to maintain a full valuation allowance in the United States and Australia was made. This is a substantially similar result under IFRS. For footnote presentation purposes, all deferred tax assets, liabilities, and valuation allowances are now reported on gross basis rather than a net basis.

The Company recognizes and measures any uncertain tax positions in accordance with ASC 740 rather than IFRIC 23. Accordingly, the Company recognizes, and measures uncertain tax positions based on a two-step process outlined in the Income Tax section of Critical Accounting Policies.

Under IFRS, the measurement of the stock-based compensation deferred tax asset is based on an estimate of the future tax deduction based on the current stock price at each reporting period. When the expected tax benefits from equity awards exceed the recorded cumulative recognized expense multiplied by the tax rate, the tax benefit up to the amount of the tax effect of the cumulative book compensation expense is recorded in the consolidated statement of operations; the excess is recorded in equity. When the expected tax benefit is less than the tax effect of the cumulative amount of recognized expense, the entire tax benefit is recorded in the consolidated statement of operations.

Under GAAP, the Company measures the stock-based compensation deferred tax asset based on the amount of compensation cost recognized for financial statement purposes. Changes in stock price do not result in a remeasurement of the related deferred tax asset. Upon settlement or expiration, excess tax benefits and tax deficiencies are recognized within the provisions for income taxes.

The tax effects resulting from other accounting changes to pre-tax income, including leases, strategic investments, and notes, are included in the tax provision under GAAP.