Consolidated Statements of Income - USD ($) shares in Thousands	3 Months Ended		6 Months Ended
	Mar. 27, 2021	Mar. 28, 2020	Mar. 27, 2021	Mar. 28, 2020
Revenues:
Product	$ 1,378,800,000	$ 623,600,000	$ 2,834,200,000	$ 1,322,900,000
Service and other	158,800,000	132,500,000	313,200,000	283,700,000
Revenues	1,537,600,000	756,100,000	3,147,400,000	1,606,600,000
Costs of revenues:
Product	300,700,000	223,300,000	585,200,000	460,800,000
Amortization, Cost of Goods Sold	64,500,000	62,900,000	126,100,000	126,500,000
Impairment of intangible assets and equipment	0	0	0	25,800,000
Service and other	86,600,000	74,100,000	170,000,000.0	163,900,000
Gross profit	1,085,800,000	395,800,000	2,266,100,000	829,600,000
Operating expenses:
Research and development	71,500,000	49,300,000	130,700,000	110,400,000
Selling and marketing	131,500,000	110,600,000	259,500,000	255,400,000
General and administrative	88,900,000	67,000,000.0	180,400,000	154,700,000
Amortization of acquired intangible assets	10,200,000	10,100,000	20,400,000	19,200,000
Impairment of intangible assets and equipment	0	0	0	4,400,000
Contingent consideration fair value adjustments	(14,700,000)	(500,000)	(10,100,000)	400,000
Restructuring and divestiture charges	1,600,000	2,900,000	3,000,000.0	3,900,000
Operating expenses	289,000,000.0	239,400,000	583,900,000	548,400,000
Income from operations	796,800,000	156,400,000	1,682,200,000	281,200,000
Interest income	300,000	1,300,000	700,000	3,500,000
Interest expense	(21,300,000)	(31,300,000)	(49,300,000)	(64,100,000)
Debt extinguishment loss	0	0	(21,600,000)	0
Other income (expense), net	4,700,000	(7,500,000)	900,000	(4,200,000)
Income before income taxes	780,500,000	118,900,000	1,612,900,000	216,400,000
Provision (benefit) for income taxes	161,100,000	24,100,000	340,100,000	(264,300,000)
Net income	619,400,000	94,800,000	1,272,800,000	480,700,000
Net loss attributable to noncontrolling interest	(500,000)	(1,500,000)	(1,500,000)	(1,800,000)
Net income attributable to Hologic	$ 619,900,000	$ 96,300,000	$ 1,274,300,000	$ 482,500,000
Net income per common share attributable to Hologic:
Basic (in usd per share)	$ 2.40	$ 0.37	$ 4.93	$ 1.82
Diluted (in usd per share)	$ 2.38	$ 0.36	$ 4.88	$ 1.81
Weighted average number of shares outstanding:
Basic (in shares)	258,473	263,238	258,539	265,566
Diluted (in shares)	260,749	264,506	261,267	267,114