Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 28, 2019	Sep. 28, 2019
Statement of Financial Position [Abstract]
Cash less assets held for sale	$ 370.8	$ 601.8
Current assets:
Accounts receivable, less reserves of $11.7 and $17.8, respectively	581.8	648.7
Inventories	380.8	444.9
Prepaid income taxes	30.9	34.9
Prepaid expenses and other current assets	62.7	62.8
Assets Held-for-sale, Not Part of Disposal Group, Current	210.6	0.0
Total current assets	1,637.6	1,793.1
Property, plant and equipment, net	452.0	470.9
Intangible assets, net	1,367.0	1,459.8
Goodwill	2,594.2	2,563.7
Other assets	261.1	154.6
Total assets	6,311.9	6,442.1
Current liabilities:
Current portion of long-term debt	302.2	271.4
Accounts payable	123.7	186.5
Accrued expenses	381.5	430.9
Deferred revenue	156.2	179.5
Current portion of capital lease obligations	1.8	1.8
Assets Held-for-sale, Not Part of Disposal Group, Current, Other	77.9	0.0
Total liabilities and stockholders’ equity	6,311.9	6,442.1
Total current liabilities	1,043.3	1,070.1
Long-term debt, net of current portion	2,769.4	2,783.6
Finance lease obligations - long term (capital lease obligations in 2019)	18.8	19.2
Deferred income tax liabilities	5.7	275.3
Deferred revenue	15.3	15.8
Other long-term liabilities	201.7	162.4
Stockholders’ equity:
Preferred stock, $0.01 par value – 1,623 shares authorized; 0 shares issued	0.0	0.0
Common stock, $0.01 par value – 750,000 shares authorized; 293,339 and 292,323 shares issued, respectively	2.9	2.9
Additional paid-in-capital	5,749.8	5,769.8
Accumulated deficit	(2,302.3)	(2,688.7)
Treasury stock, at cost – 29,462 and 24,638 shares, respectively	(1,170.9)	(926.0)
Accumulated other comprehensive loss	(28.7)	(42.3)
Total Hologic's stockholders’ equity	2,250.8	2,115.7
Stockholders' Equity Attributable to Noncontrolling Interest	6.9	0.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 2,257.7	$ 2,115.7