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Revenue Recognition - Capitalized Contract Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jan. 31, 2019	Jan. 31, 2020	Jul. 31, 2019	Jan. 31, 2019
Changes in Capitalized Contract Cost [Roll Forward]
Beginning balance	$ 70,426	$ 55,978	$ 69,785	$ 55,910
Capitalization of contract acquisition costs	9,514	9,080	15,690	13,472
Amortization of deferred contract acquisition costs	(5,890)	(4,457)	(11,425)	(8,781)
Ending balance	74,050	60,601	74,050	60,601
Deferred contract acquisition costs, current					$ 23,527	$ 21,219	$ 18,058
Deferred contract acquisition costs, noncurrent					50,523	48,566	42,543
Total deferred contract acquisition costs	$ 74,050	$ 60,601	$ 74,050	$ 60,601	$ 74,050	$ 69,785	$ 60,601

X

- Definition

Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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X

- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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X

- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer; classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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- Definition

Amount, after accumulated amortization and accumulated impairment loss, of asset recognized from cost incurred to obtain or fulfill contract with customer; classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 340
-SubTopic 40
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68051541&loc=SL49131252-203054

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- Definition

Capitalization of Contract Acquisition Costs

+ References

No definition available.

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- Definition

Changes in Capitalized Contract Cost [Roll Forward]

+ References

No definition available.

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