ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period, net of tax	$ 2,345,569	$ 2,095,228	$ 1,937,741
Total other comprehensive income (loss), net of tax	17,711	83,736	(57,598)
Balance at end of period	2,948,106	2,345,569	2,095,228
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period, net of tax	46,512	(46,484)	0
OCI before reclassifications	7,640	92,996	(44,090)
Income taxes associated with OCI before reclassifications	0	0	(2,394)
Amounts reclassified from AOCI	0	0	0
Income taxes associated with amounts reclassified from AOCI	0	0	0
Total other comprehensive income (loss), net of tax	7,640	92,996
Balance at end of period	54,152	46,512	(46,484)
Unrealized Gain (Loss) on Derivatives
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period, net of tax	(18,823)	(9,472)	0
OCI before reclassifications	(1,100)	(20,557)	(12,184)
Income taxes associated with OCI before reclassifications	327	4,906	2,917
Amounts reclassified from AOCI	14,433	8,180	(279)
Income taxes associated with amounts reclassified from AOCI	(3,492)	(1,880)	74
Total other comprehensive income (loss), net of tax	10,168	(9,351)
Balance at end of period	(8,655)	(18,823)	(9,472)
Other
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period, net of tax	(696)	(1,048)	0
OCI before reclassifications	(180)	352	(1,048)
Income taxes associated with OCI before reclassifications	0	0	0
Amounts reclassified from AOCI	0	0	0
Income taxes associated with amounts reclassified from AOCI	0	0	0
Total other comprehensive income (loss), net of tax	(180)	352
Balance at end of period	(876)	(696)	(1,048)
AOCI, net of tax, Attributable to THOR
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period, net of tax	26,993	(57,004)	0
OCI before reclassifications	6,360	72,791	(57,322)
Income taxes associated with OCI before reclassifications	327	4,906	523
Amounts reclassified from AOCI	14,433	8,180	(279)
Income taxes associated with amounts reclassified from AOCI	(3,492)	(1,880)	74
Total other comprehensive income (loss), net of tax	17,628	83,997
Balance at end of period	44,621	26,993	(57,004)
Non-controlling Interests
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period, net of tax	(855)	(594)	0
OCI before reclassifications	83	(261)	(594)
Income taxes associated with OCI before reclassifications	0	0	0
Amounts reclassified from AOCI	0	0	0
Income taxes associated with amounts reclassified from AOCI	0	0	0
Total other comprehensive income (loss), net of tax	83	(261)
Balance at end of period	(772)	(855)	(594)
Total AOCI
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at beginning of period, net of tax	26,138	(57,598)	0
OCI before reclassifications	6,443	72,530	(57,916)
Income taxes associated with OCI before reclassifications	327	4,906	523
Amounts reclassified from AOCI	14,433	8,180	(279)
Income taxes associated with amounts reclassified from AOCI	(3,492)	(1,880)	74
Total other comprehensive income (loss), net of tax	17,711	83,736
Balance at end of period	$ 43,849	$ 26,138	$ (57,598)