Related Party Transactions - Schedule of Sales and Purchases of Related Parties (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024
Related Party Transaction [Line Items]
Revenues		$ 6,476,900	$ 2,742,345	$ 10,157,666	$ 5,457,441
Stack's Bowers Galleries
Related Party Transaction [Line Items]
Revenues	[1]	0	35,240	0	80,697
Purchases	[1]	0	17,868	0	51,715
Equity method investee
Related Party Transaction [Line Items]
Revenues	[2]	216,175	284,369	281,394	559,209
Purchases	[2]	3,792	11,817	6,891	25,122
Related Party
Related Party Transaction [Line Items]
Revenues		216,175	319,609	281,394	639,906
Purchases		$ 3,792	$ 29,685	$ 6,891	$ 76,837

[1] Includes sales and purchases activity with SGI and its subsidiaries only for periods prior to the Company acquiring SGI in February 2025

[2] Includes sales and purchases activity with Pinehurst prior to the acquisition of the remaining outstanding equity interests of Pinehurst it did not previously own in February 2025 and with AMS prior to the acquisition of the remaining outstanding equity interests of AMS it did not previously own in April 2025.