Basis of Presentation	6 Months Ended
Mar. 30, 2019
Basis of Presentation [Abstract]
Basis of Presentation	Basis of Presentation The consolidated financial statements of Hologic, Inc. (“Hologic” or the “Company”) presented herein have been prepared pursuant to the rules of the Securities and Exchange Commission (“SEC”) for quarterly reports on Form 10-Q and do not include all of the information and disclosures required by U.S. generally accepted accounting principles (“GAAP”) for annual financial statements. These financial statements should be read in conjunction with the consolidated financial statements and related notes for the fiscal year ended September 29, 2018 included in the Company’s Form 10-K filed with the SEC on November 20, 2018. In the opinion of management, the financial statements and notes contain all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation of the Company’s financial position, results of operations and cash flows for the periods presented. The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation. The preparation of financial statements in conformity with U.S. GAAP requires management to make significant estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from management’s estimates if past experience or other assumptions do not turn out to be substantially accurate. Operating results for the three and six months ended March 30, 2019 are not necessarily indicative of the results to be expected for any other interim period or the entire fiscal year ending September 28, 2019. Recently Adopted Accounting Pronouncements In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Codification ("ASC") Update No. 2014-09, Revenue from Contracts with Customers (ASC 606), which was subsequently amended. The Company adopted this standard as of September 30, 2018 using the modified retrospective method for contracts that were not complete as of September 30, 2018. The Company's adoption of ASC 606 is more fully described in Note 2. In August 2018, the SEC issued the final rule on Regulation S-X, Rule 3-04 (Rule 3-04) requiring entities to disclose changes in stockholders equity in the form of a reconciliation for the current and comparative year-to-date interim periods, with subtotals for each interim period. The Company adopted Rule 3-04 in the first quarter of fiscal 2019. In October 2016, the FASB issued Accounting Standards Update ("ASU") No. 2016-16, Income Taxes (Topic 740). The guidance requires companies to recognize the income tax effects of intercompany sales and transfers of assets, other than inventory, in the income statement as income tax expense (or benefit) in the period in which the transfer occurs. The Company adopted the standard in the first quarter of fiscal 2019 (see Note 10). In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flow (Topic 230). The guidance reduces diversity in how certain cash receipts and cash payments are presented and classified in the Statements of Cash Flows. Certain of ASU 2016-15 requirements are as follows: 1) cash payments for debt prepayment or debt extinguishment costs should be classified as cash outflows for financing activities, 2) contingent consideration payments made soon after a business combination should be classified as cash outflows for investing activities and cash payment made thereafter should be classified as cash outflows for financing up to the amount of the contingent consideration liability recognized at the acquisition date with any excess classified as operating activities, 3) cash proceeds from the settlement of insurance claims should be classified on the basis of the nature of the loss, 4) cash proceeds from the settlement of Corporate-Owned Life Insurance (COLI) Policies should be classified as cash inflows from investing activities and cash payments for premiums on COLI policies may be classified as cash outflows for investing activities, operating activities, or a combination of investing and operating activities, and 5) cash paid to a tax authority by an employer when withholding shares from an employee's award for tax-withholding purposes should be classified as cash outflows for financing activities. The guidance is effective for annual periods beginning after December 15, 2017, and is applicable to the Company in fiscal 2019. The adoption of ASU 2016-15 did not have a material effect on the Company's consolidated financial statements. Subsequent Events Consideration The Company considers events or transactions that occur after the balance sheet date but prior to the issuance of the financial statements to provide additional evidence for certain estimates or to identify matters that may require additional disclosure. Subsequent events have been evaluated as required. There was one recognized subsequent event recorded in the unaudited consolidated financial statements as of and for the three and six months ended March 30, 2019. The Company entered into a Settlement and License Agreement with Enzo Life Sciences, Inc. on April 16, 2019 and recorded a $10.5 million settlement charge as of March 30, 2019 (see Note 8). There were no material unrecognized subsequent events recorded in the unaudited consolidated financial statements as of and for the three and six months ended March 30, 2019.

Basis of Presentation

The consolidated financial statements of Hologic, Inc. (“Hologic” or the “Company”) presented herein have been prepared pursuant to the rules of the Securities and Exchange Commission (“SEC”) for quarterly reports on Form 10-Q and do not include all of the information and disclosures required by U.S. generally accepted accounting principles (“GAAP”) for annual financial statements. These financial statements should be read in conjunction with the consolidated financial statements and related notes for the fiscal year ended September 29, 2018 included in the Company’s Form 10-K filed with the SEC on November 20, 2018. In the opinion of management, the financial statements and notes contain all adjustments (consisting of normal recurring accruals) considered necessary for a fair presentation of the Company’s financial position, results of operations and cash flows for the periods presented.

The consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation.

The preparation of financial statements in conformity with U.S. GAAP requires management to make significant estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. Actual results could differ from management’s estimates if past experience or other assumptions do not turn out to be substantially accurate. Operating results for the three and six months ended March 30, 2019 are not necessarily indicative of the results to be expected for any other interim period or the entire fiscal year ending September 28, 2019.

Recently Adopted Accounting Pronouncements

In May 2014, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Codification ("ASC") Update No. 2014-09, Revenue from Contracts with Customers (ASC 606), which was subsequently amended. The Company adopted this standard as of September 30, 2018 using the modified retrospective method for contracts that were not complete as of September 30, 2018. The Company's adoption of ASC 606 is more fully described in Note 2.

In August 2018, the SEC issued the final rule on Regulation S-X, Rule 3-04 (Rule 3-04) requiring entities to disclose changes in stockholders equity in the form of a reconciliation for the current and comparative year-to-date interim periods, with subtotals for each interim period. The Company adopted Rule 3-04 in the first quarter of fiscal 2019.

In October 2016, the FASB issued Accounting Standards Update ("ASU") No. 2016-16, Income Taxes (Topic 740). The guidance requires companies to recognize the income tax effects of intercompany sales and transfers of assets, other than inventory, in the income statement as income tax expense (or benefit) in the period in which the transfer occurs. The Company adopted the standard in the first quarter of fiscal 2019 (see Note 10).

In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flow (Topic 230). The guidance reduces diversity in how certain cash receipts and cash payments are presented and classified in the Statements of Cash Flows. Certain of ASU 2016-15 requirements are as follows: 1) cash payments for debt prepayment or debt extinguishment costs should be classified as cash outflows for financing activities, 2) contingent consideration payments made soon after a business combination should be classified as cash outflows for investing activities and cash payment made thereafter should be classified as cash outflows for financing up to the amount of the contingent consideration liability recognized at the acquisition date with any excess classified as operating activities, 3) cash proceeds from the settlement of insurance claims should be classified on the basis of the nature of the loss, 4) cash proceeds from the settlement of Corporate-Owned Life Insurance (COLI) Policies should be classified as cash inflows from investing activities and cash payments for premiums on COLI policies may be classified as cash outflows for investing activities, operating activities, or a combination of investing and operating activities, and 5) cash paid to a tax authority by an employer when withholding shares from an employee's award for tax-withholding purposes should be classified as cash outflows for financing activities. The guidance is effective for annual periods beginning after December 15, 2017, and is applicable to the Company in fiscal 2019. The adoption of ASU 2016-15 did not have a material effect on the Company's consolidated financial statements.

Subsequent Events Consideration

The Company considers events or transactions that occur after the balance sheet date but prior to the issuance of the financial statements to provide additional evidence for certain estimates or to identify matters that may require additional disclosure. Subsequent events have been evaluated as required. There was one recognized subsequent event recorded in the unaudited consolidated financial statements as of and for the three and six months ended March 30, 2019. The Company entered into a Settlement and License Agreement with Enzo Life Sciences, Inc. on April 16, 2019 and recorded a $10.5 million settlement charge as of March 30, 2019 (see Note 8). There were no material unrecognized subsequent events recorded in the unaudited consolidated financial statements as of and for the three and six months ended March 30, 2019.