Accumulated Other Comprehensive Loss - Schedule of Accumulated Other Comprehensive Loss (Details) $ in Thousands	12 Months Ended
	Jul. 31, 2019 USD ($)
Balance at beginning of period	$ 0
OCI before reclassifications	(57,916)
Income taxes associated with OCI before reclassifications	523	[1]
Amounts reclassified from AOCI	(279)
Income taxes associated with amounts reclassified from AOCI	74
AOCI, net of tax	(57,598)
Less: OCI attributable to non-controlling interest	(594)
AOCI, net of tax attributable to Thor Industries, Inc.	(57,004)
Foreign Currency Translation
Balance at beginning of period	0
OCI before reclassifications	(44,684)
Income taxes associated with OCI before reclassifications	(2,394)	[1]
Amounts reclassified from AOCI	0
Income taxes associated with amounts reclassified from AOCI	0
AOCI, net of tax	(47,078)
Less: OCI attributable to non-controlling interest	(594)
AOCI, net of tax attributable to Thor Industries, Inc.	(46,484)
Unrealized Gain (Loss) on Derivatives
Balance at beginning of period	0
OCI before reclassifications	(12,184)
Income taxes associated with OCI before reclassifications	2,917	[1]
Amounts reclassified from AOCI	(279)
Income taxes associated with amounts reclassified from AOCI	74
AOCI, net of tax	(9,472)
Less: OCI attributable to non-controlling interest	0
AOCI, net of tax attributable to Thor Industries, Inc.	(9,472)
Other
Balance at beginning of period	0
OCI before reclassifications	(1,048)
Income taxes associated with OCI before reclassifications	0	[1]
Amounts reclassified from AOCI	0
Income taxes associated with amounts reclassified from AOCI	0
AOCI, net of tax	(1,048)
Less: OCI attributable to non-controlling interest	0
AOCI, net of tax attributable to Thor Industries, Inc.	$ (1,048)

[1] We do not recognize deferred taxes for a majority of the foreign currency translation gains and losses because we do not anticipate reversal in the foreseeable future.