CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock, at cost
Balance (in shares) at Jul. 31, 2014		41,442,260
Balance at Jul. 31, 2014	$ 365,246	$ 4,564	$ 146,048	$ 243,306	$ 9,552	$ (38,224)
Increase (Decrease) in Stockholders' Equity
Exercises of options (in shares)		130,911
Exercises of options	608	$ 13	981			(386)
Repurchases of shares (in shares)		(100,286)
Repurchases of shares	(3,727)					(3,727)
Stock-based compensation	5,867		5,867
Issuance of restricted stock (in shares)		144,278
Issuance of restricted stock		$ 15	(15)
Cancellations of restricted stock (in shares)		(12,804)
Cancellations of restricted stock		$ (1)	1
Excess tax benefit from exercises of stock options and vesting of restricted stock	3,168		3,168
Dividends on common stock	(4,154)			(4,154)
Net income	47,953			47,953
Other comprehensive income (loss)	(8,328)				(8,328)
Balance (in shares) at Jul. 31, 2015		41,604,359
Balance at Jul. 31, 2015	406,633	$ 4,591	156,050	287,105	1,224	(42,337)
Increase (Decrease) in Stockholders' Equity
Repurchases of shares (in shares)		(67,038)
Repurchases of shares	(3,732)					(3,732)
Stock-based compensation	8,361		8,361
Issuance of restricted stock (in shares)		175,700
Issuance of restricted stock		$ 17	(17)
Cancellations of restricted stock (in shares)		(4,807)
Excess tax benefit from exercises of stock options and vesting of restricted stock	1,179		1,179
Dividends on common stock	(5,005)			(5,005)
Net income	59,953			59,953
Other comprehensive income (loss)	$ (13,019)				(13,019)
Balance (in shares) at Jul. 31, 2016	41,708,214	41,708,214
Balance at Jul. 31, 2016	$ 454,370	$ 4,608	165,573	342,053	(11,795)	(46,069)
Increase (Decrease) in Stockholders' Equity
Repurchases of shares (in shares)		(89,607)
Repurchases of shares	(6,910)					(6,910)
Stock-based compensation	8,844		8,844
Issuance of restricted stock (in shares)		116,506
Issuance of restricted stock		$ 12	(12)
Cancellations of restricted stock (in shares)		(6,179)
Cancellations of restricted stock		$ (1)	1
Excess tax benefit from exercises of stock options and vesting of restricted stock	196		196
Dividends on common stock	(5,841)			(5,841)
Net income	71,378			71,378
Other comprehensive income (loss)	$ 1,895				1,895
Balance (in shares) at Jul. 31, 2017	41,728,934	41,728,934
Balance at Jul. 31, 2017	$ 523,932	$ 4,619	$ 174,602	$ 407,590	$ (9,900)	$ (52,979)