Other Comprehensive Income Schedule of Other Comprehensive Income, Tax (Detail) - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2020	Oct. 31, 2019
Other Comprehensive Income (Loss), Tax [Abstract]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	$ (48)	$ 35
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Plan Amendments, Tax Effect	240
Other Comprehensive Income Tax Other Adjustments	7	176
Other Comprehensive Income (Loss), Tax	$ 199	$ 211