Balance Sheet Components (Details 1) - USD ($) $ in Thousands	3 Months Ended
Oct. 31, 2020	Oct. 31, 2019	Oct. 31, 2020	Jul. 31, 2020
Balance Sheet Related Disclosures [Abstract]
Accounts receivable			$ 79,528	$ 115,518
Allowance for credit losses and revenue reserves	$ (1,233)		(1,233)	(1,276)
Accounts receivable, net			$ 78,295	$ 114,242
Allowance for Doubtful Accounts Receivable [Roll Forward]
Allowance, July 31, 2020	1,276
Changes to bad debt and revenue reserves	0
Net changes to revenue reserves	(43)	$ 357
Write-offs, net	0
Allowance, October 31, 2020	$ 1,233

Accounts Receivable, Net Change To Revenue Reserves

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- Definition

Amount, before allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522

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- Definition

Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(3))
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-Name Accounting Standards Codification
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- Definition

Amount of allowance for credit loss on accounts receivable.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 20
-Section 50
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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

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Amount of direct write-downs of accounts receivable charged against the allowance.

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- References

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Amount of expense (reversal of expense) for expected credit loss on accounts receivable.

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