Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2019	Jul. 31, 2018	Jul. 31, 2017
Income Statement [Abstract]
Net sales	$ 7,864,758	$ 8,328,909	$ 7,246,952
Cost of products sold	6,891,664	7,164,243	6,203,369
Gross profit	973,094	1,164,666	1,043,583
Selling, general and administrative expenses	536,044	477,444	419,847
Amortization of intangible assets	75,638	55,118	63,925
Acquisition-related costs	114,866
Interest income	8,080	2,148	923
Interest expense	68,112	5,187	9,730
Other income (expense), net	(1,848)	3,964	5,382
Income before income taxes	184,666	633,029	556,386
Income taxes	52,201	202,878	182,132
Net income	132,465	430,151	374,254
Less: net (loss) attributable to non-controlling interests	(810)
Net income attributable to Thor Industries, Inc.	$ 133,275	$ 430,151	$ 374,254
Weighted-average common shares outstanding:
Basic	53,905,667	52,674,161	52,562,723
Diluted	54,026,686	52,853,360	52,758,442
Earnings per common share:
Basic	$ 2.47	$ 8.17	$ 7.12
Diluted	2.47	8.14	7.09
Regular dividends declared and paid per common share:	$ 1.56	$ 1.48	$ 1.32
Comprehensive income:
Net income	$ 132,465	$ 430,151	$ 374,254
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment, net of tax	(47,078)
Unrealized gain (loss) on derivatives, net of tax	(9,472)
Other (loss), net of tax	(1,048)
Total other comprehensive (loss), net of tax	(57,598)
Total Comprehensive income	74,867	430,151	374,254
Comprehensive (loss) attributable to non-controlling interest	(1,404)
Comprehensive income attributable to Thor Industries, Inc.	$ 76,271	$ 430,151	$ 374,254