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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands | Total | Share Repurchase Program [Member] | Common Stock [Member] | Additional Paid-in-Capital [Member] | Accumulated Deficit [Member] | Accumulated Other Comprehensive Income [Member] | Treasury Stock [Member] | Treasury Stock [Member] Share Repurchase Program [Member] | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Sep. 30, 2017 |  |  | 287,853 |  |  |  | 12,560 |  |
Balance at Sep. 30, 2017 | $ 2,784,700,000 |  | $ 2,900,000 | $ 5,630,800,000 | $ (2,382,700,000) | $ (16,200,000) | $ (450,100,000) |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) |  |  | 795 |  |  |  |  |  |
Exercise of stock options | 17,300,000 |  |  | 17,300,000 |  |  |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes (in shares) |  |  | 804 |  |  |  |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes | (16,700,000) |  |  | (16,700,000) |  |  |  |  |
Common stock issued under the employee stock purchase plan (in shares) |  |  | 448 |  |  |  |  |  |
Common stock issued under the employee stock purchase plan | 15,600,000 |  |  | 15,600,000 |  |  |  |  |
Stock-based compensation expense | 65,000,000.0 |  |  | 65,000,000.0 |  |  |  |  |
Repurchase of common stock (in shares) |  |  |  |  |  |  | 7,252 |  |
Repurchase of common stock | (275,800,000) |  |  |  |  |  | $ (275,800,000) |  |
Reacquisition of equity component from convertible notes repurchase, net of taxes | (40,700,000) |  |  | (40,700,000) |  |  |  |  |
Foreign currency translation adjustment | (8,100,000) |  |  |  |  | (8,100,000) |  |  |
Adjustment to minimum pension liability, net | 500,000 |  |  |  |  | 500,000 |  |  |
Unrealized losses on derivatives, net of taxes | (5,700,000) |  |  |  |  | (5,700,000) |  |  |
Loss reclassified from accumulated other comprehensive loss to the statement of operations, net | 3,600,000 |  |  |  |  | 3,600,000 |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 400,000 |  |  |  |  | 400,000 |  |  |
Net income (loss) attributable to Hologic | (111,300,000) |  |  |  | (111,300,000) |  |  |  |
Payments to Noncontrolling Interests | 0 |  |  |  |  |  |  |  |
Balance (in shares) at Sep. 29, 2018 |  |  | 289,900 |  |  |  | 19,812 |  |
Balance at Sep. 29, 2018 | 2,428,800,000 |  | $ 2,900,000 | 5,671,300,000 | (2,494,000,000.0) | (25,500,000) | $ (725,900,000) |  | $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Accounting standard transition adjustment - ASC 606 | 6,400,000 |  |  |  | 6,400,000 |  |  |  |
Accounting standard transition adjustment - ASU 2016-16 | 2,500,000 |  |  |  | 2,500,000 |  |  |  |
Exercise of stock options (in shares) |  |  | 1,304 |  |  |  |  |  |
Exercise of stock options | 32,800,000 |  |  | 32,800,000 |  |  |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes (in shares) |  |  | 645 |  |  |  |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes | (12,800,000) |  |  | (12,800,000) |  |  |  |  |
Common stock issued under the employee stock purchase plan (in shares) |  |  | 474 |  |  |  |  |  |
Common stock issued under the employee stock purchase plan | 16,500,000 |  |  | 16,500,000 |  |  |  |  |
Stock-based compensation expense | 62,000,000.0 |  |  | 62,000,000.0 |  |  |  |  |
Repurchase of common stock (in shares) |  |  |  |  |  |  | 4,826 |  |
Repurchase of common stock | (200,100,000) |  |  |  |  |  | $ (200,100,000) |  |
Foreign currency translation adjustment | (14,800,000) |  |  |  |  | (14,800,000) |  |  |
Adjustment to minimum pension liability, net | (600,000) |  |  |  |  | (600,000) |  |  |
Unrealized losses on derivatives, net of taxes | (8,000,000.0) |  |  |  |  | (8,000,000.0) |  |  |
Unrealized gain on interest rate swap | 3,500,000 |  |  |  |  | 3,500,000 |  |  |
Loss reclassified from accumulated other comprehensive loss to the statement of operations, net | 3,100,000 |  |  |  |  | 3,100,000 |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 0 |  |  |  |  |  |  |  |
Net income (loss) attributable to Hologic | (203,600,000) |  |  |  | (203,600,000) |  |  |  |
Payments to Noncontrolling Interests | 0 |  |  |  |  |  |  |  |
Balance (in shares) at Sep. 28, 2019 |  |  | 292,323 |  |  |  | 24,638 |  |
Balance at Sep. 28, 2019 | $ 2,115,700,000 |  | $ 2,900,000 | 5,769,800,000 | (2,688,700,000) | (42,300,000) | $ (926,000,000.0) |  | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Exercise of stock options (in shares) | 1,800 |  | 1,761 |  |  |  |  |  |
Exercise of stock options | $ 48,300,000 |  |  | 48,300,000 |  |  |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes (in shares) |  |  | 611 |  |  |  |  |  |
Vesting of restricted stock units, net of shares withheld for employee taxes | (14,200,000) |  |  | (14,200,000) |  |  |  |  |
Common stock issued under the employee stock purchase plan (in shares) |  |  | 412 |  |  |  |  |  |
Common stock issued under the employee stock purchase plan | 17,600,000 |  |  | 17,600,000 |  |  |  |  |
Stock-based compensation expense | 83,300,000 |  |  | 83,300,000 |  |  |  |  |
Repurchase of common stock (in shares) |  |  |  |  |  |  | 9,064 | 3,907 |
Repurchase of common stock | (448,600,000) | $ (205,000,000.0) |  |  |  |  | $ (448,600,000) | $ (205,000,000.0) |
Foreign currency translation adjustment | 18,500,000 |  |  |  |  | 18,500,000 |  |  |
Adjustment to minimum pension liability, net | (100,000) |  |  |  |  | (100,000) |  |  |
Unrealized losses on derivatives, net of taxes | (500,000) |  |  |  |  | (500,000) |  |  |
Unrealized gain on interest rate swap | (27,600,000) |  |  |  |  | (27,600,000) |  |  |
Loss reclassified from accumulated other comprehensive loss to the statement of operations, net | 2,300,000 |  |  |  |  | 2,300,000 |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 0 |  |  |  |  |  |  |  |
Net income (loss) attributable to Hologic | 1,110,500,000 |  |  |  | 1,115,200,000 |  |  |  | (4,700,000)
Payments to Noncontrolling Interests | (1,800,000) |  |  |  |  |  |  |  | (1,800,000)
Noncontrolling Interest, Increase from Business Combination | 8,600,000 |  |  |  |  |  |  |  | 8,600,000
Balance (in shares) at Sep. 26, 2020 |  |  | 295,107 |  |  |  | 37,609 |  |
Balance at Sep. 26, 2020 | 2,707,300,000 |  | $ 2,900,000 | $ 5,904,800,000 | (1,573,200,000) | $ (49,700,000) | $ (1,579,600,000) |  | $ 2,100,000
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Accounting standard transition adjustment | Accounting Standards Update 2018-01 [Member] | $ 300,000 |  |  |  | $ 300,000 |  |  |  |

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