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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2019	Jan. 31, 2018	Jun. 19, 2018
Stock Based Compensation And Stockholders Equity [Line Items]
Total compensation expenses	$ 4,956	$ 4,413	$ 9,486	$ 8,731
Withholding taxes payable			$ 4,418	7,657
Stock repurchase program authorized amount					$ 250,000
Stock repurchase program expiration date			Jun. 19, 2020
Regular dividend declared per common share			$ 0.39
Dividends declared and paid			$ 41,189
Restricted Stock Units (RSUs)
Stock Based Compensation And Stockholders Equity [Line Items]
Withholding taxes payable			$ 4,418	$ 7,657

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Stock Based Compensation And Stockholders Equity [Line Items]

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.

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Amount of cash outflow to satisfy an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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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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Amount of stock repurchase plan authorized.

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Expiration date for the purchase of an entity's own shares under a stock repurchase plan, in the CCYY-MM-DD format.

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