Note 4 - Business Combinations (Details Textual) $ in Thousands, € in Millions						12 Months Ended
		Mar. 31, 2024 USD ($)	Feb. 02, 2023 USD ($)	Oct. 03, 2022 USD ($)	Jul. 01, 2022 USD ($)	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Jun. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)	Oct. 03, 2022 EUR (€)
Payments to Acquire Businesses, Net of Cash Acquired						$ (0)	$ 386,508	$ 125,876
Goodwill						691,409	784,339	513,623
Restricted Cash, Current						2,069	4,650	382,596
Business Combination, Contingent Consideration, Liability									$ 0	$ 18,500
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory						0	9,664	0
Goodwill, Impairment Loss						111,317
Business Combination, Acquisition Related Costs	[1]					$ 4,874	13,842	17,329
Ziath, Ltd. [Member]
Payments to Acquire Businesses, Net of Cash Acquired			$ 16,000
Goodwill			12,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities			1,100
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			300
Business Acquisition, Goodwill, Expected Tax Deductible Amount			0
Ziath, Ltd. [Member] | Developed Technology Rights [Member]
Payments to Acquire Businesses, Net of Cash Acquired			$ 4,100
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Year)			10 years
Ziath, Ltd. [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles			$ 600
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Year)			13 years
Ziath, Ltd. [Member] | Trademarks [Member]
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Year)			13 years
B Medical Systems S.a.r.l. [Member]
Payments to Acquire Businesses, Net of Cash Acquired				$ 424,000
Goodwill				228,241
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities				43,393
Business Acquisition, Goodwill, Expected Tax Deductible Amount				0
Business Combination, Consideration Transferred				432,200
Business Combination, Consideration Transferred, Liabilities Incurred				$ 17,000
Number of Countries in which Entity Operates				150							150
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High | €											€ 50
Prepaid Expense, Current								43,100
Restricted Cash, Current				$ 381,000
Business Combination, Contingent Consideration, Liability, Achievement of Certain Revenue Targets, Term (Year)				1 year
Business Combination, Contingent Consideration, Liability									$ 0	$ 18,500
Goodwill, Measurement Period Adjustment							9,200
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment							1,000
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Intangibles							400
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Assets							9,600
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Inventory							2,300
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Liabilities							800
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Deferred Taxes							400
Goodwill, Impairment Loss		$ 111,300
Business Combination, Acquisition Related Costs							4,900
Business Acquisition, Pro Forma Information, Purchase Accounting Adjustment, Property, Plant and Equipment, Inventory, and Intangible Asset Step-up Depreciation and Amortization Expense							5,300	(23,200)
Business Acquisition, Pro Forma Information, Purchase Accounting Adjustment, Property, Plant and Equipment, Inventory, and Intangible Asset Step-up Depreciation and Amortization Expense							(5,300)	23,200
Business Acquisition, Pro Forma Information, Purchase Accounting Adjustment, Transaction Costs							3,600	(4,900)
Business Acquisition, Pro Forma Information, Purchase Accounting Adjustment, Transaction Costs							(3,600)	4,900
Business Acquisition, Pro Forma Information, Purchase Accounting Adjustment, Debt Interest Expense								6,100
Business Acquisition, Pro Forma Information, Purchase Accounting Adjustment, Research and Development Expense Capitalization								1,100
Business Acquisition, Pro Forma Information, Purchase Accounting Adjustment, Tax Cost (Benefit)								$ 6,400
B Medical Systems S.a.r.l. [Member] | Life Sciences Products [Member]
Goodwill				$ 228,200
B Medical Systems S.a.r.l. [Member] | Measurement Input, Discount Rate [Member]
Intangible Asset, Measurement Input				0.13							0.13
B Medical Systems S.a.r.l. [Member] | Developed Technology Rights [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles				$ 100,600
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Year)				10 years
B Medical Systems S.a.r.l. [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles				$ 36,700
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Year)				16 years
B Medical Systems S.a.r.l. [Member] | Trademarks [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles				$ 5,500
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Year)				5 years
B Medical Systems S.a.r.l. [Member] | Order or Production Backlog [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles				$ 600
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Year)				1 year
Barkey Holding GmbH [Member]
Goodwill					$ 60,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities					$ 9,800
Acquired Finite-Lived Intangible Assets, Weighted Average Useful Life (Year)					15 years
Business Acquisition, Goodwill, Expected Tax Deductible Amount					$ 0
Business Combination, Consideration Transferred					84,800
Goodwill, Measurement Period Adjustment							2,700
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Financial Liabilities							$ 2,700
Barkey Holding GmbH [Member] | Developed Technology Rights [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles					29,000
Barkey Holding GmbH [Member] | Customer Relationships [Member]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles					$ 3,000

[1] Includes expenses related to governance-related matters.