Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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SEGMENT INFORMATION - Additional Information (Detail) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2020 USD ($)	Jan. 31, 2019 USD ($)	Jan. 31, 2020 USD ($) segment	Jan. 31, 2019 USD ($)	Jul. 31, 2019 USD ($)
Segment Reporting Information [Line Items]
Number of operating segments \| segment			2
Number of reportable segments \| segment			2
Total assets	$ 788,895		$ 788,895		$ 731,563
Net revenue:	215,452	$ 206,223	440,605	$ 421,356
United States
Segment Reporting Information [Line Items]
Net revenue:	145,293	136,347	299,714	282,411
China
Segment Reporting Information [Line Items]
Net revenue:	32,569	37,910	72,026	74,521
Netherlands
Segment Reporting Information [Line Items]
Net revenue:	11,071	14,403	21,719	29,347
Other
Segment Reporting Information [Line Items]
Net revenue:	$ 26,519	$ 17,563	$ 47,146	$ 35,077