Heritage AspenTech - USD ($)				1 Months Ended	8 Months Ended	9 Months Ended		12 Months Ended
	May 16, 2022	Oct. 10, 2021	Oct. 01, 2020	Jun. 30, 2022	May 16, 2022	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2021	Sep. 30, 2020
Business Combination and Asset Acquisition [Abstract]
Goodwill				$ 8,266,809,000		$ 8,266,809,000		$ 1,044,383,000	$ 77,000,000
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired						(5,571,931,000)	$ 0	(1,588,802,000)
Cash Acquired from Acquisition	$ 5,846,000,000
Other Payments to Acquire Businesses	168,300,000
Business Acquisition, Pro Forma Revenue						819,098,000		1,031,065,000
Business Acquisition, Pro Forma Net Income (Loss)						18,193,000		(55,410,000)
Business Acquisition, Pro Forma Adjustment						244,800,000		391,700,000
Total Revenue						405,296,000	223,625,000	300,640,000	130,495,000
Net income				66,369,000	$ (13,223,000)	53,146,000	$ (9,406,000)	(20,608,000)	(20,317,000)
Intangible assets, net	$ 4,390,000,000			$ 5,112,781,000	$ 4,390,000,000	5,112,781,000		837,655,000
Business Acquisition, Share Price	$ 87.69				$ 87.69
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 102,305,000
Business Combination, Acquisition Related Costs						$ 3,700,000
Business Acquisition, Percentage of Voting Interests Acquired				55.00%		55.00%
Business Combination, Consideration Transferred		$ 6,014,000,000.000
Goodwill				$ 8,266,809,000		$ 8,266,809,000		1,044,383,000	77,000,000
Business Acquisition, Goodwill, Expected Tax Deductible Amount	34,000,000				$ 34,000,000
Heritage AspenTech
Business Combination and Asset Acquisition [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	4,390,667,000				4,390,667,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	64,342,000				64,342,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	5,502,448,000				5,502,448,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable	53,841,000				53,841,000
Deferred Revenue	62,319,000				62,319,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt	279,531,000				279,531,000
Deferred Income Tax Liabilities, Net	1,079,001,000				1,079,001,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	62,279,000				62,279,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	1,536,971,000				1,536,971,000
Tangible assets acquired, net	3,965,477,000				3,965,477,000
Goodwill	7,222,799,000				7,222,799,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	11,188,276,000				11,188,276,000
Business Acquisition [Line Items]
Cash and cash equivalents	273,728,000				273,728,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other	730,548,000				730,548,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets	64,342,000				64,342,000
Accounts receivable, gross	43,163,000				43,163,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles	4,390,667,000				4,390,667,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other	62,279,000				62,279,000
Total Revenue				173,800,000
Tangible assets acquired, net	3,965,477,000				3,965,477,000
Net income				$ 71,800,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets	5,502,448,000				5,502,448,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities	1,536,971,000				1,536,971,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable	53,841,000				53,841,000
Deferred Revenue	62,319,000				62,319,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt	$ 279,531,000				$ 279,531,000
Business Acquisition, Percentage of Voting Interests Acquired	45.00%				45.00%
Deferred Income Tax Liabilities, Net	$ 1,079,001,000				$ 1,079,001,000
Goodwill	7,222,799,000				7,222,799,000
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net	$ 11,188,276,000				$ 11,188,276,000
Emerson Electric Co.
Business Combination and Asset Acquisition [Abstract]
Merger Agreement Ownership Percentage of Combined Company				0.55
Business Acquisition [Line Items]
Merger Agreement Ownership Percentage of Combined Company				0.55
Business Acquisition, Percentage of Voting Interests Acquired	55.00%				55.00%
Business Combination, Consideration Transferred	$ 6,014,000,000.000	$ 6,014,000,000.000
OSI Inc.
Business Combination and Asset Acquisition [Abstract]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets			$ 28,182,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets			888,547,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable			1,321,000
Deferred Income Tax Liabilities, Net			192,592,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other			1,200,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities			267,128,000
Tangible assets acquired, net			621,419,000
Goodwill			967,383,000
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired			1,588,802,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other			3,576,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets			28,182,000
Accounts receivable, gross			24,782,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other			1,200,000
Total Revenue								173,300,000
Tangible assets acquired, net			621,419,000
Net income								(46,400,000)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets			888,547,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities			267,128,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable			1,321,000
Deferred Income Tax Liabilities, Net			192,592,000
Goodwill			$ 967,383,000
Heritage AspenTech
Business Combination and Asset Acquisition [Abstract]
Goodwill				$ 7,222,426,000		7,222,426,000		0	0
Business Acquisition [Line Items]
Payments to Acquire Businesses, Net of Cash Acquired	11,188,276,000
Goodwill				7,222,426,000		7,222,426,000		0	$ 0
Common Stock
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 11,085,971,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	66,662,482
Common Stock | Heritage AspenTech
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	$ 5,240,000,000
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares	27,998,104
Trademarks
Business Acquisition [Line Items]
Intangible assets, net				455,021,000		455,021,000		28,353,000
Trademarks | Heritage AspenTech
Business Acquisition [Line Items]
Intangible assets, net	$ 430,000,000				$ 430,000,000
Unclassified Indefinite-lived Intangible Assets | Heritage AspenTech
Business Acquisition [Line Items]
Intangible assets, net	3,960,000,000				3,960,000,000
Patented Technology [Member]
Business Acquisition [Line Items]
Intangible assets, net				1,728,279,000		1,728,279,000		434,782,000
Patented Technology [Member] | Heritage AspenTech
Business Acquisition [Line Items]
Intangible assets, net	1,350,000,000				1,350,000,000
Customer Relationships [Member]
Business Acquisition [Line Items]
Intangible assets, net				$ 2,927,850,000		$ 2,927,850,000		373,885,000
Customer Relationships [Member] | Heritage AspenTech
Business Acquisition [Line Items]
Intangible assets, net	2,300,000,000				2,300,000,000
Order or Production Backlog | Heritage AspenTech
Business Acquisition [Line Items]
Intangible assets, net	$ 310,000,000				$ 310,000,000
Order or Production Backlog | OSI Inc.
Business Acquisition [Line Items]
Intangible assets, net								$ 30,400,000