Consolidated Statements of Income and Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018
Income Statement [Abstract]
Net sales	$ 2,506,583	$ 2,251,570	$ 5,553,135	$ 6,454,798
Cost of products sold	2,214,153	1,934,825	4,911,853	5,534,540
Gross profit	292,430	316,745	641,282	920,258
Selling, general and administrative expenses	176,983	119,449	364,745	370,800
Amortization of intangible assets	25,259	13,882	50,376	41,236
Acquisition-related costs	13,363		112,511
Interest income	2,547	460	5,444	1,242
Interest expense	35,509	1,383	37,244	4,149
Other income (expense), net	(2,340)	(1,966)	(6,937)	3,366
Income before income taxes	41,523	180,525	74,913	508,681
Income taxes	10,085	46,737	34,939	166,735
Net income	31,438	133,788	39,974	341,946
Less: net (loss) attributable to non-controlling interests	(1,246)		(1,246)
Net income attributable to Thor Industries, Inc.	$ 32,684	$ 133,788	$ 41,220	$ 341,946
Weighted-average common shares outstanding:
Basic	55,063,473	52,695,365	53,515,491	52,667,016
Diluted	55,166,067	52,853,541	53,627,627	52,844,040
Earnings per common share:
Basic	$ 0.59	$ 2.54	$ 0.77	$ 6.49
Diluted	0.59	2.53	0.77	6.47
Regular dividends declared and paid per common share:	$ 0.39	$ 0.37	$ 1.17	$ 1.11
Comprehensive income:
Net income	$ 31,438	$ 133,788	$ 39,974	$ 341,946
Other comprehensive income (loss), net of tax
Foreign currency translation adjustment	(34,183)		(34,183)
Unrealized gain (loss) on derivatives, net of tax	(3,781)		(3,781)
Total other comprehensive income (loss), net of tax	(37,964)		(37,964)
Total Comprehensive income (loss)	(6,526)	133,788	2,010	341,946
Comprehensive (loss) attributable to non-controlling interest	(1,319)		(1,319)
Comprehensive income (loss) attributable to Thor Industries, Inc.	$ (5,207)	$ 133,788	$ 3,329	$ 341,946