Significant Accounting Policies (Policies)	3 Months Ended
Significant Accounting Policies (Policies)	Sep. 30, 2019
Accounting Policies [Abstract]
Principles of Consolidation	Principles of Consolidation The accompanying consolidated financial statements include the accounts of Aspen Technology, Inc. and our wholly owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.
Loss Contingencies	Loss Contingencies We accrue estimated liabilities for loss contingencies arising from claims, assessments, litigation and other sources when it is probable that a liability has been incurred and the amount of the claim, assessment or damages can be reasonably estimated. We believe that we have sufficient accruals to cover any obligations resulting from claims, assessments or litigation that have met these criteria.
Foreign Currency Transactions	Foreign Currency Transactions Foreign currency exchange gains and losses generated from the settlement and remeasurement of transactions denominated in currencies other than the functional currency of our subsidiaries are recognized in our results of operations as incurred as a component of other income, net. Net foreign currency exchange gains were $1.1 million and $0.1 million during the three months ended September 30, 2019 and 2018, respectively.
Research and Development Expense	Research and Development Expense We charge research and development expenditures to expense as the costs are incurred. Research and development expenses consist primarily of personnel expenses related to the creation of new products, enhancements and engineering changes to existing products and costs of acquired technology prior to establishing technological feasibility.
Restricted Cash	Restricted Cash As of September 30, 2019, our restricted cash balance of $0.7 million related to funds subject to contractual restrictions. We did not have a restricted cash balance as of June 30, 2019.
Recently Issued Accounting Pronouncements	(g) New Accounting Pronouncements Adopted in Fiscal 2020 In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842). Under the amendment, lessees are required to recognize virtually all of their leases on the balance sheet, by recording a right-of-use asset and lease liability. The ASU is effective for annual periods, including interim periods within those annual periods, beginning after December 15, 2018. We adopted Topic 842 effective July 1, 2019 using the effective date method with a modified retrospective transition approach. Results for reporting periods beginning on or after July 1, 2019 are presented under ASC 842, while prior period amounts were not adjusted and continue to be reported in accordance with the Company’s historic accounting under ASC 840 “Leases.” We elected the package of practical expedients permitted under the transition guidance within the new standard, which allowed the carry forward of historical assessments of whether a contract contains a lease, lease classification and initial direct costs. The most significant impact of the adoption of Topic 842 was the recognition of operating lease right-of-use assets of $28.5 million and current and non-current operating lease liabilities of $7.4 million and $26.5 million, respectively, and the reversal of deferred rent of $6.5 million as of July 1, 2019. The adoption of Topic 842 did not have a material impact on our operating results or cash flows, and there was no impact on our debt covenants. See Note 4, "Leases," to our Unaudited Consolidated Financial Statements for more information on the impact of adopting Topic 842. (h) Recently Issued Accounting Pronouncements None.