Accumulated Other Comprehensive Loss, Tax - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2021	Jul. 31, 2020	Jul. 31, 2019
Other Comprehensive Income, Tax [Abstract]
Cash flow hedges	$ (123)	$ 283	$ 55
Pension and other post-retirement benefits	95	229	164
Other income tax adjustments and currency translation	378	337	972
Income tax (expense) benefit related to items of other comprehensive income (loss)	$ (406)	$ 175	$ (753)