Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019
Income Statement [Abstract]
Net sales	$ 2,003,133	$ 1,290,576	$ 4,161,918	$ 3,046,552
Cost of products sold	1,746,727	1,148,980	3,596,701	2,697,700
Gross profit	256,406	141,596	565,217	348,852
Selling, general and administrative expenses	162,357	85,069	350,821	187,762
Amortization of intangible assets	24,273	12,526	48,566	25,117
Acquisition-related costs	0	42,059	0	99,148
Interest income	974	1,675	1,949	2,897
Interest expense	27,234	859	55,259	1,735
Other income (expense), net	1,404	(885)	1,034	(4,597)
Income before income taxes	34,863	1,873	103,497	33,390
Income taxes	7,837	7,290	24,626	24,854
Net income (loss)	27,026	(5,417)	78,871	8,536
Less: Net loss attributable to non-controlling interest	(1,647)	0	(867)	0
Net income (loss) attributable to Thor Industries, Inc.	$ 28,673	$ (5,417)	$ 79,738	$ 8,536
Weighted-average common shares outstanding:
Basic (in shares)	55,198,756	52,806,981	55,146,915	52,766,739
Diluted (in shares)	55,396,116	52,867,687	55,310,385	52,883,645
Earnings (loss) per common share:
Basic (in dollars per share)	$ 0.52	$ (0.10)	$ 1.45	$ 0.16
Diluted (in dollars per share)	$ 0.52	$ (0.10)	$ 1.44	$ 0.16
Comprehensive income:
Net income (loss)	$ 27,026	$ (5,417)	$ 78,871	$ 8,536
Other comprehensive loss, net of tax
Foreign currency translation adjustment	(11,902)	0	(10,909)	0
Unrealized loss on derivatives, net of tax	(224)	0	(3,946)	0
Total other comprehensive loss, net of tax	(12,126)	0	(14,855)	0
Total Comprehensive income (loss)	14,900	(5,417)	64,016	8,536
Less: Comprehensive loss attributable to non-controlling interest	(1,949)	0	(1,311)	0
Comprehensive income (loss) attributable to Thor Industries, Inc.	$ 16,849	(5,417)	65,327	8,536
Goodwill and Intangible Asset Impairment		$ 0	$ 10,057	$ 0