Segments and Geographic Information - Schedule of Segment Reporting Information, by Segment (Details) - USD ($)	3 Months Ended		6 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2025	Dec. 31, 2024	Jun. 30, 2025
Segment Reporting Information [Line Items]
Revenues	$ 6,476,900,000	$ 2,742,345,000	$ 10,157,666,000	$ 5,457,441,000
Cost of sales by segment	6,383,530,000	2,697,578,000	9,991,399,000	5,369,231,000
Gross profit	$ 93,370,000	$ 44,767,000	$ 166,267,000	$ 88,210,000
Gross margin percentage by segment	1.442%	1.632%	1.637%	1.616%
Selling, general, and administrative expenses	$ (59,784,000)	$ (25,754,000)	$ (119,606,000)	$ (52,371,000)
Depreciation and amortization expense	(7,638,000)	(4,639,000)	(15,221,000)	(9,348,000)
Interest income	5,789,000	6,794,000	11,360,000	13,881,000
Interest expense	(16,253,000)	(10,363,000)	(28,853,000)	(20,350,000)
Earnings (losses) from equity method investments	1,009,000	(2,410,000)	101,000	(1,832,000)
Other income (expense), net	250,000	461,000	2,483,000	661,000
Unrealized gains (losses) on foreign exchange	(966,000)	(840,000)	(1,065,000)	(662,000)
Total net income (loss) before provision for income taxes	15,777,000	8,016,000	15,466,000	18,189,000
Advertising expense	(9,536,000)	(4,746,000)	(19,378,000)	(9,392,000)
Inventories	1,535,749,000		1,535,749,000		$ 1,279,545,000
Assets	3,811,885,000		3,811,885,000		2,215,431,000
Capital expenditures for long-lived assets by segment	(3,998,000)	(3,801,000)	(5,972,000)	(4,408,000)
Goodwill	228,696,000		228,696,000		228,650,000
Intangible assets	128,802,000		128,802,000		137,314,000
United States
Segment Reporting Information [Line Items]
Revenues	1,663,982,000	1,099,582,000	3,007,907,000	2,113,437,000
Inventories	1,320,873,000		1,320,873,000		1,150,678,000
Assets	3,263,503,000		3,263,503,000		1,917,452,000
Canada
Segment Reporting Information [Line Items]
Revenues	1,129,557,000	547,292,000	1,602,622,000	872,964,000
Europe
Segment Reporting Information [Line Items]
Revenues	3,490,624,000	1,047,545,000	5,262,820,000	2,371,228,000
Inventories	43,178,000		43,178,000		32,987,000
Assets	59,518,000		59,518,000		40,625,000
North America, excluding United States
Segment Reporting Information [Line Items]
Inventories	110,286,000		110,286,000		52,225,000
Assets	350,552,000		350,552,000		169,864,000
Asia Pacific
Segment Reporting Information [Line Items]
Revenues	176,270,000	45,146,000	262,263,000	93,580,000
Africa
Segment Reporting Information [Line Items]
Revenues	79,000	3,000	79,000	3,000
Australia
Segment Reporting Information [Line Items]
Revenues	16,336,000	2,767,000	21,761,000	6,219,000
South America
Segment Reporting Information [Line Items]
Revenues	52,000	10,000	214,000	10,000
Asia
Segment Reporting Information [Line Items]
Inventories	61,412,000		61,412,000		43,655,000
Assets	138,312,000		138,312,000		87,490,000
Wholesale Sales & Ancillary Services
Segment Reporting Information [Line Items]
Revenues	4,887,966,000	2,173,340,000	7,704,837,000	4,400,329,000
Cost of sales by segment	4,866,146,000	2,153,606,000	7,661,775,000	4,360,605,000
Gross profit	$ 21,820,000	$ 19,734,000	$ 43,062,000	$ 39,724,000
Gross margin percentage by segment	0.446%	0.908%	0.559%	0.903%
Operating Income (Loss), Total	$ (33,007,000)	$ (18,484,000)	$ (65,164,000)	$ (34,980,000)
Selling, general, and administrative expenses	(21,279,000)	(11,408,000)	(43,338,000)	(24,142,000)
Depreciation and amortization expense	(1,622,000)	(806,000)	(3,248,000)	(1,608,000)
Interest income	2,999,000	4,124,000	6,005,000	8,139,000
Interest expense	(14,175,000)	(8,075,000)	(24,983,000)	(15,555,000)
Earnings (losses) from equity method investments	968,000	(2,459,000)	24,000	(1,908,000)
Other income (expense), net	86,000	(70,000)	19,000	(65,000)
Unrealized gains (losses) on foreign exchange	16,000	210,000	357,000	159,000
Total net income (loss) before provision for income taxes	(11,187,000)	1,250,000	(22,102,000)	4,744,000
Advertising expense	(1,679,000)	(526,000)	(3,601,000)	(1,146,000)
Inventories	1,107,815,000		1,107,815,000		1,049,200,000
Assets	2,460,842,000		2,460,842,000		1,274,226,000
Capital expenditures for long-lived assets by segment	(3,152,000)	(3,607,000)	(4,478,000)	(4,112,000)
Goodwill	39,191,000		39,191,000		39,191,000
Intangible assets	17,713,000		17,713,000		18,322,000
Direct-to-Consumer
Segment Reporting Information [Line Items]
Revenues	1,588,934,000	569,005,000	2,452,829,000	1,057,112,000
Cost of sales by segment	1,517,384,000	543,972,000	2,329,624,000	1,008,626,000
Gross profit	$ 71,550,000	$ 25,033,000	$ 123,205,000	$ 48,486,000
Gross margin percentage by segment	4.503%	4.399%	5.023%	4.587%
Operating Income (Loss), Total	$ (45,565,000)	$ (19,593,000)	$ (87,528,000)	$ (37,291,000)
Selling, general, and administrative expenses	(38,171,000)	(14,058,000)	(75,636,000)	(27,649,000)
Depreciation and amortization expense	(6,016,000)	(3,832,000)	(11,973,000)	(7,736,000)
Interest income	35,000	44,000	56,000	96,000
Interest expense	(595,000)	(697,000)	(1,017,000)	(1,181,000)
Other income (expense), net	164,000	0	2,464,000	0
Unrealized gains (losses) on foreign exchange	(982,000)	(1,050,000)	(1,422,000)	(821,000)
Total net income (loss) before provision for income taxes	25,985,000	5,440,000	35,677,000	11,195,000
Advertising expense	(7,796,000)	(4,165,000)	(15,663,000)	(8,121,000)
Inventories	427,934,000		427,934,000		230,345,000
Assets	1,227,803,000		1,227,803,000		844,760,000
Capital expenditures for long-lived assets by segment	(846,000)	(194,000)	(1,494,000)	(296,000)
Goodwill	189,505,000		189,505,000		189,459,000
Intangible assets	111,089,000		111,089,000		118,992,000
Secured Lending
Segment Reporting Information [Line Items]
Revenues			0
Gross profit			0
Operating Income (Loss), Total	979,000	1,326,000	1,891,000	2,250,000
Selling, general, and administrative expenses	(334,000)	(288,000)	(632,000)	(580,000)
Depreciation and amortization expense	0	(1,000)	0	(4,000)
Interest income	2,755,000	2,626,000	5,299,000	5,646,000
Interest expense	(1,483,000)	(1,591,000)	(2,853,000)	(3,614,000)
Earnings (losses) from equity method investments	41,000	49,000	77,000	76,000
Other income (expense), net	0	531,000	0	726,000
Total net income (loss) before provision for income taxes	979,000	1,326,000	1,891,000	2,250,000
Advertising expense	(61,000)	(55,000)	(114,000)	(125,000)
Assets	123,240,000		123,240,000		96,445,000
Operating Segments | Wholesale Sales & Ancillary Services
Segment Reporting Information [Line Items]
Revenues	6,046,811,000	2,637,921,000	9,556,020,000	5,185,919,000
Cost of sales by segment	6,025,241,000	2,618,118,000	9,512,971,000	5,146,307,000
Gross profit	$ 21,570,000	$ 19,803,000	$ 43,049,000	$ 39,612,000
Gross margin percentage by segment	0.357%	0.751%	0.45%	0.764%
Operating Income (Loss), Total	$ (32,908,000)	$ (18,439,000)	$ (64,998,000)	$ (34,888,000)
Assets	2,820,288,000		2,820,288,000		1,485,370,000
Eliminations of Inter-Segment Sales
Segment Reporting Information [Line Items]
Cost of sales by segment	(1,159,095,000)	(464,512,000)	(1,851,196,000)	(785,702,000)
Eliminations of Inter-Segment Sales | Wholesale Sales & Ancillary Services
Segment Reporting Information [Line Items]
Revenues	(1,158,845,000)	(464,581,000)	(1,851,183,000)	(785,590,000)
Gross profit	250,000	(69,000)	13,000	112,000
Operating Income (Loss), Total	(99,000)	(45,000)	(166,000)	(92,000)
Assets	(359,446,000)		(359,446,000)		$ (211,144,000)
Eliminations of Inter-Segment Sales | Direct-to-Consumer
Segment Reporting Information [Line Items]
Revenues	$ 41,200,000	$ 46,700,000	$ 86,100,000	$ 67,100,000