Business overview and basis of presentation (Policies)	3 Months Ended
Dec. 28, 2019
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 December 28, 2019 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 three months ended December 28, 2019 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 three months ended December 28, 2019 and December 29, 2018 spanned 13 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 In February 2016, the FASB issued ASU No. 2016-02, Leases, and other subsequent 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 lease payments. The Company adopted Topic 842 as of September 29, 2019, using the modified retrospective method under ASU 2018-11. As such, prior periods were not retrospectively adjusted. There was no cumulative effect to 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 is primarily attributable to deferred rent and rent incentives. There was no impact on the Company's condensed consolidated statement of operations and comprehensive income or condensed consolidated statements of cash flows. See Note 6. Leases 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 new 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. Recent accounting pronouncements pending adoption In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, and other subsequent amendments including ASU 2019-11, Codification Improvements to Topic 326, Financial Instruments - Credit Losses (collectively referred to as "Topic 326") which provides a new impairment model that requires measurement and recognition of expected credit losses for most financial assets and certain other instruments, including but not limited to accounts receivable and available for sale debt securities. The standard will be effective for the Company in the first quarter of fiscal 2021. The Company is currently evaluating the impact on the Company's consolidated financial statements. 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 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 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 and impact on the Company's consolidated financial statements. 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 Topic 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)

3 Months Ended

Dec. 28, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The accompanying condensed consolidated financial statements are unaudited. The condensed consolidated balance sheet as of December 28, 2019 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 three months ended December 28, 2019 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 three months ended December 28, 2019 and December 29, 2018 spanned 13 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

In February 2016, the FASB issued ASU No. 2016-02, Leases, and other subsequent 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 lease payments.

The Company adopted Topic 842 as of September 29, 2019, using the modified retrospective method under ASU 2018-11. As such, prior periods were not retrospectively adjusted. There was no cumulative effect to 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 is primarily attributable to deferred rent and rent incentives. There was no impact on the Company's condensed consolidated statement of operations and comprehensive income or condensed consolidated statements of cash flows. See Note 6. Leases 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 new 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.

Recent accounting pronouncements pending adoption

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments, and other subsequent amendments including ASU 2019-11, Codification Improvements to Topic 326, Financial Instruments - Credit Losses (collectively referred to as "Topic 326") which provides a new impairment model that requires measurement and recognition of expected credit losses

for most financial assets and certain other instruments, including but not limited to accounts receivable and available for sale debt securities. The standard will be effective for the Company in the first quarter of fiscal 2021. The Company is currently evaluating the impact on the Company's consolidated financial statements.

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 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 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 and impact on the Company's consolidated financial statements.

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 Topic 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.