Business Combinations - Amounts of Assets and Liabilities at Fair Value as of Acquisition Date (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Feb. 02, 2023	Oct. 03, 2022	Sep. 30, 2022	Jul. 01, 2022	Sep. 30, 2021	Apr. 02, 2021	Dec. 03, 2020
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill	$ 784,339			$ 513,623		$ 469,356
Life Sciences Services
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill	359,035			$ 359,011		$ 359,218
Ziath Ltd and Subsidiaries
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Deferred income taxes, net		$ 1,100
Goodwill		12,000
Ziath Ltd and Subsidiaries | Completed Technology
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets		4,100
Ziath Ltd and Subsidiaries | Trademarks and Trade Names
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets		300
Ziath Ltd and Subsidiaries | Customer Relationships
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets		$ 600
B Medical Systems S.a.r.l and Subsidiaries
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Accounts receivable			$ 19,549
Inventory			51,978
Other assets			10,769
Property, plant and equipment			54,149
Other liabilities			(32,533)
Deferred income taxes, net			43,393
Goodwill			228,241
Total purchase price, net of cash acquired			432,160
Increase (decrease) to goodwill	9,200
Increase (decrease) to property, plant and equipment	(1,000)
Increase (decrease) to intangible assets	400
Increase (decrease) to other assets	(9,600)
Increase (decrease) to inventory	2,300
Increase (decrease) in other liabilities	(800)
Increase (decrease) to deferred taxes	(400)
B Medical Systems S.a.r.l and Subsidiaries | Completed Technology
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets			100,600
B Medical Systems S.a.r.l and Subsidiaries | Trademarks
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets			5,500
B Medical Systems S.a.r.l and Subsidiaries | Customer Relationships
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets			36,700
B Medical Systems S.a.r.l and Subsidiaries | Order or Production Backlog
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets			$ 600
Barkey Holding GmbH and Subsidiaries
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Deferred income taxes, net					$ 9,800
Goodwill					60,500
Increase (decrease) to goodwill	2,700
Increase (decrease) to accrued liabilities	$ 2,700
Barkey Holding GmbH and Subsidiaries | Completed Technology
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets					29,000
Barkey Holding GmbH and Subsidiaries | Customer Relationships
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets					$ 3,000
Abeyatech LLC
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill							$ 4,400
Other assets and liabilities, net							3,000
Abeyatech LLC | Completed Technology
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets							$ 11,900
Trans-Hit Biomarkers
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Intangible assets								$ 7,800
Deferred income taxes, net								2,400
Goodwill								9,300
Trans-Hit Biomarkers | Life Sciences Services
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net [Abstract]
Goodwill								$ 9,300