Amount of cash outflow in the form of ordinary dividends to Class A common shareholders of the parent entity.

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Amount of cash outflow in the form of ordinary dividends to Class B common shareholders of the parent entity.

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Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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Value of stock issued as a result of the exercise of stock options.

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Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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Stockholders' Equity (Details) - USD ($) $ in Thousands	3 Months Ended
Stockholders' Equity (Details) - USD ($) $ in Thousands	Oct. 31, 2018	Oct. 31, 2017	Aug. 01, 2018	Jul. 31, 2018	Jul. 31, 2017
Schedule Of Stockholders Equity [Line Items]
Stockholders' Equity Attributable to Parent	$ 772,943	$ 712,670		$ 752,112	$ 700,140
Net earnings	30,637	25,836
Other Comprehensive Income (Loss), Net of Tax	(9,830)	(7,380)
Stock Issued During Period, Value, Stock Options Exercised	(10,064)	(1,223)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	(91)	(254)
Share-based Compensation	4,965	3,744
Stock Repurchased During Period, Value	(1,863)
Cumulative Effect of New Accounting Principle in Period of Adoption	(2,137)
Payment of Ordinary Dividends, Common Stock Class A	(10,403)	(9,964)
Payment of Ordinary Dividends, Common Stock Class B	(693)	(675)
Common Stock [Member]
Schedule Of Stockholders Equity [Line Items]
Stockholders' Equity Attributable to Parent	548	548		548	548
Additional Paid-in Capital [Member]
Schedule Of Stockholders Equity [Line Items]
Stockholders' Equity Attributable to Parent	326,182	322,657		325,631	322,608
Stock Issued During Period, Value, Stock Options Exercised	(4,505)	(3,863)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	(91)	(168)
Share-based Compensation	4,965	3,744
Retained Earnings [Member]
Schedule Of Stockholders Equity [Line Items]
Stockholders' Equity Attributable to Parent	570,858	522,333		553,454	507,136
Net earnings	30,637	25,836
Cumulative Effect of New Accounting Principle in Period of Adoption			$ (2,137)
Payment of Ordinary Dividends, Common Stock Class A	(10,403)	(9,964)
Payment of Ordinary Dividends, Common Stock Class B	(693)	(675)
Treasury Stock [Member]
Schedule Of Stockholders Equity [Line Items]
Stockholders' Equity Attributable to Parent	(58,414)	(80,806)		(71,120)	(85,470)
Stock Issued During Period, Value, Stock Options Exercised	(14,569)	(5,086)
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation		422
Stock Repurchased During Period, Value	1,863
AOCI Attributable to Parent [Member]
Schedule Of Stockholders Equity [Line Items]
Stockholders' Equity Attributable to Parent	(66,231)	(52,062)		$ (56,401)	$ (44,682)
Other Comprehensive Income (Loss), Net of Tax	$ (9,830)	$ (7,380)