Business overview and basis of presentation (Policies)	6 Months Ended
Mar. 28, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of presentation and preparation	Basis of presentation and preparation The accompanying condensed consolidated financial statements are unaudited. The condensed consolidated balance sheet as of March 28, 2020 has been derived from the audited financial statements of the Company. The accompanying condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) for interim financial information, and in management’s opinion, includes all adjustments, consisting of only normal recurring adjustments, necessary for the fair statement of the Company’s financial position, its results of operations and its cash flows for the interim periods presented. The results of operations for the six months ended March 28, 2020 are not necessarily indicative of the results to be expected for the full fiscal year or any other period. On November 14, 2019, the Company completed the acquisition of 100% of the equity interests in Snips SAS ("Snips"), a France-based provider of an artificial intelligence voice technology. The results of Snips' operations have been included in the Company’s consolidated results of operations since the date of acquisition. The accompanying condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the fiscal year ended September 28, 2019 (the “Annual Report”), filed with the Securities and Exchange Commission (“SEC”) on November 25, 2019. Certain prior period amounts have been reclassified to conform to the current period presentation. The Company operates on a 52- week or 53- week fiscal year ending on the Saturday nearest September 30 each year. The Company’s fiscal year is divided into four quarters of 13 weeks, each beginning on a Sunday, and containing two 4-week periods followed by a 5-week period. An additional week is included in the fourth fiscal quarter approximately every five years to realign fiscal quarters with calendar quarters. This last occurred in the fourth quarter of the Company’s fiscal year ended October 3, 2015, and will reoccur this fiscal year ending October 3, 2020. The six months ended March 28, 2020 and March 30, 2019 spanned 26 weeks each. As used in this Quarterly Report on Form 10-Q, “fiscal 2020” refers to the fiscal year ending October 3, 2020 and “fiscal 2019” refers to the fiscal year ended September 28, 2019.
Use of estimates and judgment	Use of estimates and judgments The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and judgments that affect the amounts reported and disclosed in the condensed consolidated financial statements and accompanying notes. Actual results could differ materially from those estimates. On an ongoing basis, the Company evaluates its estimates and judgments compared to historical experience and expected trends.
Recently adopted accounting pronouncements and recent accounting pronouncements pending adoption	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 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 condensed consolidated statement of operations and comprehensive income (loss) or condensed 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 guidance did not have a material impact on the Company’s consolidated financial statements. 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 the standard in the second quarter of fiscal 2020. The adoption did not have a material impact on the Company’s consolidated financial statements or disclosures for this fiscal quarter. 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 is currently evaluating the impact of adoption on the Company's consolidated financial statements. 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 does not expect the adoption of this guidance 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 unit of account guidance 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.

Business overview and basis of presentation (Policies)

6 Months Ended

Mar. 28, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The accompanying condensed consolidated financial statements are unaudited. The condensed consolidated balance sheet as of March 28, 2020 has been derived from the audited financial statements of the Company. The accompanying condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) for interim financial information, and in management’s opinion, includes all adjustments, consisting of only normal recurring adjustments, necessary for the fair statement of the Company’s financial position, its results of operations and its cash flows for the interim periods presented. The results of operations for the six months ended March 28, 2020 are not necessarily indicative of the results to be expected for the full fiscal year or any other period.

On November 14, 2019, the Company completed the acquisition of 100% of the equity interests in Snips SAS ("Snips"), a France-based provider of an artificial intelligence voice technology. The results of Snips' operations have been included in the Company’s consolidated results of operations since the date of acquisition.

The accompanying condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes thereto contained in the Company’s Annual Report on Form 10-K for the fiscal year ended September 28, 2019 (the “Annual Report”), filed with the Securities and Exchange Commission (“SEC”) on November 25, 2019. Certain prior period amounts have been reclassified to conform to the current period presentation.

The Company operates on a 52- week or 53- week fiscal year ending on the Saturday nearest September 30 each year. The Company’s fiscal year is divided into four quarters of 13 weeks, each beginning on a Sunday, and containing two 4-week periods followed by a 5-week period. An additional week is included in the fourth fiscal quarter approximately every five years to realign fiscal quarters with calendar quarters. This last occurred in the fourth quarter of the Company’s fiscal year ended October 3, 2015, and will reoccur this fiscal year ending October 3, 2020. The six months ended March 28, 2020 and March 30, 2019 spanned 26 weeks each. As used in this Quarterly Report on Form 10-Q, “fiscal 2020” refers to the fiscal year ending October 3, 2020 and “fiscal 2019” refers to the fiscal year ended September 28, 2019.

Use of estimates and judgment

Use of estimates and judgments

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and judgments that affect the amounts reported and disclosed in the condensed consolidated financial statements and accompanying notes. Actual results could differ materially from those estimates. On an ongoing basis, the Company evaluates its estimates and judgments compared to historical experience and expected trends.

Recently adopted accounting pronouncements and recent accounting pronouncements pending adoption

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 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 condensed consolidated statement of operations and comprehensive income (loss) or condensed 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 guidance did not have a material impact on the Company’s consolidated financial statements.

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 the standard in the second quarter of fiscal 2020. The adoption did not have a material impact on the Company’s consolidated financial statements or disclosures for this fiscal quarter.

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 is currently evaluating the impact of adoption on the Company's consolidated financial statements.

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 does not expect the adoption of this guidance 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 unit of account guidance 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.