Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury stock, at cost
Beginning Balance (in shares) at Jul. 31, 2019		41,771,228
Beginning Balance at Jul. 31, 2019	$ 661,537	$ 4,636	$ 204,795	$ 539,097	$ (22,197)	$ (64,794)
Increase (Decrease) in Stockholders' Equity
Repurchases of shares (in shares)		(49,614)
Repurchases of shares	(3,613)					(3,613)
Stock-based compensation	2,404		2,404
Issuance of shares (in shares)		751,471
Issuance of shares	60,000	$ 75	59,925
Equity vests/option exercises (in shares)		104,686
Equity vests/option exercises	919	$ 11	908
Cancellations of restricted stock (in shares)		(946)
Net income (loss)	5,767			5,767
Other comprehensive income (loss)	5,177				5,177
Ending Balance (in shares) at Oct. 31, 2019		42,576,825
Ending Balance at Oct. 31, 2019	$ 732,191	$ 4,722	268,032	544,864	(17,020)	(68,407)
Beginning Balance (in shares) at Jul. 31, 2020	42,162,218	42,162,218
Beginning Balance at Jul. 31, 2020	$ 729,599	$ 4,681	273,040	548,334	(27,599)	(68,857)
Increase (Decrease) in Stockholders' Equity
Repurchases of shares (in shares)		(30,532)
Repurchases of shares	(1,454)					(1,454)
Stock-based compensation	$ 3,422		3,422
Equity vests/option exercises (in shares)	15,000	112,195
Equity vests/option exercises		$ 12	(12)
Net income (loss)	$ 24,464			24,464
Other comprehensive income (loss)	$ 2,350				2,350
Ending Balance (in shares) at Oct. 31, 2020	42,243,881	42,243,881
Ending Balance at Oct. 31, 2020	$ 758,381	$ 4,693	$ 276,450	$ 572,798	$ (25,249)	$ (70,311)