Summary of significant accounting policies	6 Months Ended
Mar. 30, 2019
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. Recently adopted accounting pronouncements In June 2018, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2018-07, Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting, which aligns the accounting for share-based payment awards issued to nonemployees with the guidance applicable to grants to employees. Under this new standard, equity-classified share-based payment awards issued to nonemployees will be measured on the grant date, instead of the current requirement to remeasure the awards through the performance completion date. Further, compensation cost for awards with performance conditions will be recognized when it is probable the conditions will be achieved, rather than upon the actual achievement. In the second quarter of fiscal 2019, the Company early adopted the standard using the prospective approach. There was no cumulative effect entry needed to adjust the opening retained earnings balance upon adoption. The adoption of this guidance did not have a material impact on the Company's consolidated financial statements. In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which reduces diversity in practice in how certain transactions are classified in the statement of cash flows. In the first quarter of fiscal 2019, the Company retrospectively adopted this standard to all periods presented in this Quarterly Report on Form 10-Q. The adoption of this guidance did not have a material impact on the Company’s consolidated financial statements. In October 2016, the FASB issued ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory. ASU 2016-16 removes the prohibition in Accounting Standards Codification (“ASC”) Topic 740, Income Taxes, against the immediate recognition of the current and deferred income tax effects of intra-entity transfers of assets other than inventory. ASU 2016-16 is intended to reduce the complexity of U.S. GAAP and diversity in practice related to the tax consequences of certain types of intra-entity asset transfers, particularly those involving intellectual property. In the first quarter of fiscal 2019, the Company adopted this standard on a modified retrospective basis. The adoption of this guidance did not have a material impact on the Company’s consolidated financial statements. In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which enhances and clarifies the classification and presentation of restricted cash in the statement of cash flows. In the first quarter of fiscal 2019, the Company adopted this standard retrospectively to all periods presented in this Quarterly Report on Form 10-Q. The Company now includes restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling beginning and ending amounts shown on the statement of cash flows. The adoption of this guidance did not have a material impact on the Company’s consolidated financial statements. In August 2018, the SEC adopted the final rule under SEC Release No. 33-10532, Disclosure Update and Simplification, amending certain disclosure requirements that were redundant, duplicative, overlapping, outdated or superseded. In addition, the amendments expanded the disclosure requirements on the analysis of stockholders’ equity for interim financial statements. Under the amendments, an analysis of changes in each caption of stockholders’ equity presented in the balance sheet must be provided in a note or separate statement. The analysis should present a reconciliation of the beginning balance to the ending balance of each period for which a statement of comprehensive income is required to be filed. This final rule became effective November 5, 2018. In the first quarter of fiscal 2019, the Company adopted this standard for all periods presented in this Quarterly Report on Form 10-Q, presenting the activity of the stockholders’ equity accounts in the accompanying consolidated statements stockholders’ equity (deficit) for the periods presented. Recent accounting pronouncements pending adoption In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), and other subsequent amendments to amend historical lease accounting in order to increase transparency and comparability among entities. The standard requires lessees to recognize lease assets and lease liabilities on the balance sheet and disclose key information about leasing arrangements. This standard is effective for public entities for fiscal years beginning after December 15, 2018, and interim periods within those years, with early adoption permitted. The Company expects to adopt the new lease standard in the first quarter of fiscal 2020. Upon adoption, the Company will recognize any qualifying right-of-use assets and lease liabilities on its condensed consolidated balance sheets, which will increase the Company’s total assets and total liabilities. The Company is currently evaluating the impact of adoption on its 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 guidance is effective for public entities for fiscal years beginning after December 15, 2019, and for interim periods within those fiscal years, with early adoption permitted. The Company is currently evaluating the timing of the adoption and its impact on the Company’s consolidated financial statements. 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. 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.

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.

Recently adopted accounting pronouncements

In June 2018, the Financial Accounting Standards Board (the “FASB”) issued Accounting Standards Update (“ASU”) No. 2018-07, Compensation—Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting, which aligns the accounting for share-based payment awards issued to nonemployees with the guidance applicable to grants to employees. Under this new standard, equity-classified share-based payment awards issued to nonemployees will be measured on the grant date, instead of the current requirement to remeasure the awards through the performance completion date. Further, compensation cost for awards with performance conditions will be recognized when it is probable the conditions will be achieved, rather than upon the actual achievement. In the second quarter of fiscal 2019, the Company early adopted the standard using the prospective approach. There was no cumulative effect entry needed to adjust the opening retained earnings balance upon adoption. The adoption of this guidance did not have a material impact on the Company's consolidated financial statements.

In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments, which reduces diversity in practice in how certain transactions are classified in the statement of cash flows. In the first quarter of fiscal 2019, the Company retrospectively adopted this standard to all periods presented in this Quarterly Report on Form 10-Q. The adoption of this guidance did not have a material impact on the Company’s consolidated financial statements.

In October 2016, the FASB issued ASU No. 2016-16, Income Taxes (Topic 740): Intra-Entity Transfers of Assets Other Than Inventory. ASU 2016-16 removes the prohibition in Accounting Standards Codification (“ASC”) Topic 740, Income Taxes, against the immediate recognition of the current and deferred income tax effects of intra-entity transfers of assets other than inventory. ASU 2016-16 is intended to reduce the complexity of U.S. GAAP and diversity in practice related to the tax consequences of certain types of intra-entity asset transfers, particularly those involving intellectual property. In the first quarter of fiscal 2019, the Company adopted this standard on a modified retrospective basis. The adoption of this guidance did not have a material impact on the Company’s consolidated financial statements.

In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, which enhances and clarifies the classification and presentation of restricted cash in the statement of cash flows. In the first quarter of fiscal 2019, the Company adopted this standard retrospectively to all periods presented in this Quarterly Report on Form 10-Q. The Company now includes restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling beginning and ending amounts shown on the statement of cash flows. The adoption of this guidance did not have a material impact on the Company’s consolidated financial statements.

In August 2018, the SEC adopted the final rule under SEC Release No. 33-10532, Disclosure Update and Simplification, amending certain disclosure requirements that were redundant, duplicative, overlapping, outdated or superseded. In addition, the amendments expanded the disclosure requirements on the analysis of stockholders’ equity for interim financial statements. Under the amendments, an analysis of changes in each caption of stockholders’ equity presented in the balance sheet must be provided in a note or separate statement. The analysis should present a reconciliation of the beginning balance to the ending balance of each period for which a statement of comprehensive income is required to be filed. This final rule became effective November 5, 2018. In the first quarter of fiscal 2019, the Company adopted this standard for all periods presented in this Quarterly Report on Form 10-Q, presenting the activity of the stockholders’ equity accounts in the accompanying consolidated statements stockholders’ equity (deficit) for the periods presented.

Recent accounting pronouncements pending adoption

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), and other subsequent amendments to amend historical lease accounting in order to increase transparency and comparability among entities. The standard requires lessees to recognize lease assets and lease liabilities on the balance sheet and disclose key information about leasing arrangements. This standard is effective for public entities for fiscal years beginning after December 15, 2018, and interim periods within those years, with early adoption permitted. The Company expects to adopt the new lease standard in the first quarter of fiscal 2020. Upon adoption, the Company will recognize any qualifying right-of-use assets and lease liabilities on its condensed consolidated balance sheets, which will increase the Company’s total assets and total liabilities. The Company is currently evaluating the impact of adoption on its 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 guidance is effective for public entities for fiscal years beginning after December 15, 2019, and for interim periods within those fiscal years, with early adoption permitted. The Company is currently evaluating the timing of the adoption and its impact on the Company’s consolidated financial statements.

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. 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.