Interim Reporting (Details) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
	May 16, 2022	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2020
Quarterly Financial Information Disclosure [Abstract]
Increase (Decrease) in Accounts Receivable		$ (11,204)	$ 25,538	$ (4,486)	$ 5,476
Increase (Decrease) in Contract with Customer, Asset		78,122	21,658	(82,898)	17,868
Increase (Decrease) in Deferred Charges		4,992	10,165	(4,992)	0
Increase (decrease) in lease liabilities		5,558	13,655	(5,979)	4,673
Increase (Decrease) in Prepaid Expense and Other Assets		8,776	(7,625)	(6,965)	(1,553)
Accounts payable, accrued expenses, income taxes payable and other liabilities		(23,674)	18,315	(25,908)	(1,740)
Contract liabilities		22,431	16,979	17,291	22,252
Net Cash Provided by (Used in) Operating Activities		28,962	299,209	19,776	54,800
Payments to Acquire Property, Plant, and Equipment		(2,263)	(6,577)	(4,870)	(6,185)
Proceeds from Sale of Property, Plant, and Equipment		(91)	0	(91)	0
Payments to Acquire Businesses, Net of Cash Acquired	$ 11,188,276	(5,571,931)	(72,498)	(5,572,996)	(1,588,802)
Payments for equity method investments		(24)	(700)	(24)	0
Payments for Software to be Sold		508	366	(508)	0
Purchase of other assets		(553)	(1,000)	(838)	(5)
Net Cash Provided by (Used in) Investing Activities		(5,575,188)	(107,317)	(5,579,145)	(1,594,982)
Issuance of shares of common stock		5,702	36,736	5,702	0
Payments related to tax withholding		(1,676)	(20,836)	(1,676)	0
Payments for Deferred Business Acquisition Costs		1,200	1,363	1,200	0
Repayments of Lines of Credit			(276,000)	(6,000)
Net transfers (to) from Parent Company		(5,971,995)	(19,933)	(5,987,190)	(1,551,537)
Net Cash Provided by (Used in) Financing Activities		5,968,821	(383,771)	5,984,016	1,551,537
Effect of exchange rate changes on cash and cash equivalents		1,417	(16,637)	1,419	(141)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect		424,012	(208,516)	426,066	11,214
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents		$ 449,725	241,209	449,725	$ 25,713	$ 23,659	$ 14,499
Net foreign currency losses (gains)			$ 4,079	$ 1,232