CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jan. 31, 2021	Jul. 31, 2020
Assets, Current [Abstract]
Cash and cash equivalents	$ 277,588	$ 217,643
Accounts Receivable, Allowance for Credit Loss, Current	7,450	7,157
Accounts receivable, net of allowances for credit losses of $7,450 and $7,157, respectively	154,052	146,181
Inventories	122,922	135,662
Prepaid expenses and other current assets	12,774	9,962
Total current assets	567,336	509,448
Property, plant and equipment—net	122,088	115,068
Goodwill	420,726	416,034
Net Book Value	19,809	22,334
Deferred income taxes	8,261	8,845
Operating lease assets	38,849	41,899
Other assets	30,813	28,838
Total	1,207,882	1,142,466
Current liabilities:
Accounts payable	67,483	62,547
Accrued compensation and benefits	52,098	41,546
Taxes, other than income taxes	8,518	8,057
Accrued income taxes	9,393	8,652
Current operating lease liabilities	16,534	15,304
Other current liabilities	47,518	49,782
Total current liabilities	201,544	185,888
Current operating lease liabilities	27,134	31,982
Other liabilities	59,869	61,524
Total liabilities	288,547	279,394
Stockholders’ equity:
Class A nonvoting common stock—Issued 51,261,487 shares, and outstanding 48,486,758 and 48,456,954 shares, respectively	513	513
Class B voting common stock—Issued and outstanding, 3,538,628 shares	35	35
Additional paid-in capital	334,077	331,761
Retained earnings	745,960	704,456
Treasury stock—2,774,729 and 2,804,533 shares, respectively, of Class A nonvoting common stock, at cost	(109,789)	(107,216)
Accumulated Other Comprehensive Income (Loss), Net of Tax	(51,461)	(66,477)
Total stockholders’ equity	919,335	863,072
Total	$ 1,207,882	$ 1,142,466
Class A nonvoting common stock
Stockholders’ equity:
Common stock, shares outstanding	48,486,758	48,456,954
Treasury stock, shares	2,774,729	2,804,533
Common Class B [Member]
Stockholders’ equity:
Common stock, shares outstanding	3,538,628	3,538,628