Summary of significant accounting policies	9 Months Ended
Summary of significant accounting policies	Jun. 27, 2020
Accounting Policies [Abstract]
Summary of significant accounting policies	Summary of significant accounting policies There have been no changes in the Company’s significant accounting policies, recently adopted accounting pronouncements or recent accounting pronouncements pending adoption from those disclosed in the Annual Report, except as noted below. Business combinations The Company uses the acquisition method of accounting for business combinations and recognizes assets acquired and liabilities assumed measured at their fair values on the date acquired. Goodwill is measured as of the acquisition date as the excess of consideration transferred over the net acquisition date fair value of the assets acquired and the liabilities assumed. The Company uses its best estimates and assumptions, including but not limited to, future expected cash flows, expected asset lives and discount rates, to assign a fair value to the tangible and intangible assets acquired and liabilities assumed in business combinations as of the acquisition date. These estimates are inherently uncertain and subject to refinement. During the measurement period, which may be up to one year from the acquisition date, adjustments to the fair value of these tangible and intangible assets acquired and liabilities assumed may be recorded, with the corresponding offset to goodwill. Upon the conclusion of the measurement period or final determination of the fair value of assets acquired and liabilities assumed, whichever comes first, any subsequent adjustments are recorded to the Company’s consolidated statements of operations and comprehensive income (loss). Goodwill and indefinite-lived intangible assets shall be tested for impairment on an annual basis or between annual tests if an event occurs or circumstances change that would more likely than not reduce the fair value of the reporting unit below its carrying value. In connection with the Company's evaluation of goodwill impairment, the Company performs a qualitative assessment to determine if it is more likely than not that the fair value of a reporting unit is less than its carrying amount. If the qualitative assessment is not conclusive, the Company proceeds to test goodwill for impairment, including comparing the fair value of the reporting unit to its carrying value (including attributable goodwill). The Company determines fair value for its reporting unit using an income or market approach incorporating market participant considerations and management’s assumptions on revenue growth rates, operating margins, discount rates and expected capital expenditures. Fair value determinations may include both internal and third-party valuations. The Company performs its annual goodwill impairment assessment during the third quarter of each fiscal year and more frequently if circumstances otherwise dictate. As part of the Company's qualitative and quantitative assessment performed in the third quarter of fiscal 2020, no impairment was identified. Recently adopted accounting pronouncements Leases In February 2016, the Financial Accounting Standards Board ("FASB") issued ASU No. 2016-02, Leases, and it subsequently issued amendments to the initial guidance (collectively referred to as "Topic 842"), which modifies lease accounting in order to increase transparency and comparability among entities. Topic 842 requires lessees to recognize operating leases as right–of–use assets and lease liabilities on the balance sheets. The lease liabilities are initially measured at the present value of the future lease payments. The Company adopted Topic 842 as of September 29, 2019, using the modified retrospective method under ASU 2018-11, Leases (Topic 842): Targeted Improvements. As such, prior periods were not retrospectively adjusted. There was no cumulative effect to the accumulated deficit upon adoption. The Company elected the transition package of three practical expedients permitted within the standard, which eliminates the requirements to reassess prior conclusions about lease identification, lease classification and initial direct costs. Adoption of the new standard resulted in the recording of right-of-use ("ROU") assets and operating lease liabilities of approximately $63.7 million and $73.7 million, respectively on September 29, 2019, with an increase to total assets and liabilities of approximately $62.5 million. The difference between the right-of-use assets and lease liabilities was primarily attributable to deferred rent and rent incentives. There was no impact on the Company's consolidated statement of operations and comprehensive income (loss) or consolidated statements of cash flows. See Note 6 for further information on leases. Internal-use software In August 2018, the FASB issued ASU No. 2018-15, Intangibles - Goodwill and Other - Internal-Use Software (Subtopic 350-40): Customer's Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract. The guidance aligns the requirements for capitalizing implementation costs incurred in a cloud computing arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. In the first quarter of fiscal 2020, the Company prospectively adopted this standard. The adoption of this standard has not had a material impact on the Company’s consolidated financial statements or disclosures. Goodwill In January 2017, the FASB issued ASU No. 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill, which simplifies the subsequent measurement of goodwill by eliminating the second step of the goodwill impairment test. The second step measures a goodwill impairment loss by comparing the implied fair value of a reporting unit's goodwill with the carrying amount of that goodwill. Under the new guidance, a company will record an impairment charge based on the excess of a reporting unit's carrying amount over its fair value. The Company early adopted this standard in the second quarter of fiscal 2020. The adoption of this standard has not had a material impact on the Company’s consolidated financial statements or disclosures. Recent accounting pronouncements pending adoption In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments, and it subsequently issued amendments to the initial guidance (collectively referred to as "Topic 326"), which provide a new impairment model that requires measurement and recognition of expected credit losses for most financial assets and certain other instruments, including accounts receivable. The standard will be effective for the Company in the first quarter of fiscal 2021, with early adoption permitted. The Company intends to adopt this standard in the first quarter of fiscal 2021 and does not expect the adoption to have a material impact on the Company's consolidated financial statements or disclosures. In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. The new standard eliminates disclosures such as the amount of and reasons for transfers between Level 1 and Level 2 of the fair value hierarchy and adds new disclosure requirements for Level 3 measurements. The standard will be effective for the Company in the first quarter of fiscal 2021, with early adoption permitted. The Company is currently evaluating the timing of adoption but does not expect the adoption to have a material impact on the Company's consolidated financial statements or disclosures. In November 2018, the FASB issued ASU No. 2018-18, Collaborative Arrangements (Topic 808): Clarifying the Interaction between Topic 808 and Topic 606. This standard resolves the diversity in practice concerning whether certain transactions between collaborative arrangement participants should be accounted for as revenue under Accounting Standards Codification 606, Revenue from Contracts with Customers ("Topic 606"). This standard specifies when a participant is a customer in a collaboration, adds guidance for unit of account to align with Topic 606 and provides presentation guidance for collaborative arrangements. This standard will be effective for the Company in the first quarter of fiscal 2021, with early adoption permitted. The Company is currently evaluating the timing of adoption and impact on the Company's consolidated financial statements. In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes. This standard simplifies the accounting for income taxes by removing certain exceptions to the general principles in Accounting Standards Codification Topic 740 ("ASC 740") as well as by improving consistent application of the topic by clarifying and amending existing guidance. This standard will be effective for the Company in the first quarter of fiscal 2022, with early adoption permitted. The Company is currently evaluating the timing of adoption and impact on the Company's consolidated financial statements.