CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Income Statement [Abstract]
Net sales	$ 1,681,735	$ 2,506,583	$ 5,843,653	$ 5,553,135
Cost of products sold	1,476,102	2,214,153	5,072,803	4,911,853
Gross profit	205,633	292,430	770,850	641,282
Selling, general and administrative expenses	128,147	176,983	478,968	364,745
Amortization of intangible assets	24,079	25,259	72,645	50,376
Impairment charges	0	0	10,057	0
Acquisition-related costs	0	13,363	0	112,511
Interest income	847	2,547	2,796	5,444
Interest expense	26,868	35,509	82,127	37,244
Other income (expense), net	(6,157)	(2,340)	(5,123)	(6,937)
Income before income taxes	21,229	41,523	124,726	74,913
Income tax provision (benefit)	(1,555)	10,085	23,071	34,939
Net income	22,784	31,438	101,655	39,974
Less: Net loss attributable to non-controlling interest	(1,284)	(1,246)	(2,151)	(1,246)
Net income attributable to Thor Industries, Inc.	$ 24,068	$ 32,684	$ 103,806	$ 41,220
Weighted-average common shares outstanding:
Basic (in shares)	55,198,756	55,063,473	55,163,943	53,515,491
Diluted (in shares)	55,392,982	55,166,067	55,337,665	53,627,627
Earnings per common share:
Basic (in dollars per share)	$ 0.44	$ 0.59	$ 1.88	$ 0.77
Diluted (in dollars per share)	$ 0.43	$ 0.59	$ 1.88	$ 0.77
Comprehensive income (loss):
Net income	$ 22,784	$ 31,438	$ 101,655	$ 39,974
Other comprehensive loss, net of tax
Foreign currency translation adjustment	(25,245)	(34,183)	(36,154)	(34,183)
Unrealized loss on derivatives, net of tax	(7,763)	(3,781)	(11,709)	(3,781)
Total other comprehensive loss, net of tax	(33,008)	(37,964)	(47,863)	(37,964)
Total Comprehensive income (loss)	(10,224)	(6,526)	53,792	2,010
Less: Comprehensive loss attributable to non-controlling interest	(1,483)	(1,319)	(2,794)	(1,319)
Comprehensive income (loss) attributable to Thor Industries, Inc.	$ (8,741)	$ (5,207)	$ 56,586	$ 3,329