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Leases - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended		12 Months Ended
	Jul. 31, 2021	Apr. 30, 2021	Jul. 31, 2020	Jul. 31, 2021	Jul. 31, 2020	Jan. 31, 2021
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets	$ 275,747			$ 275,747		$ 414,143
Operating lease liabilities	291,268			291,268		443,000
Operating lease, lease not yet commenced, payment	$ 17,000			$ 17,000
Minimum
Lessee, Lease, Description [Line Items]
Operating lease, lease not yet commenced, term (years)	2 years			2 years
Maximum
Lessee, Lease, Description [Line Items]
Operating lease, lease not yet commenced, term (years)	8 years			8 years
Pleasanton, California | Affiliated Entity
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets						134,000
Operating lease liabilities						146,000
Asset acquisition, consideration transferred		$ 173,000
Expenses from transactions with related party		$ 2,000				$ 2,000
Rent expense	$ 0		$ 4,000	$ 2,000	$ 7,000

X

- Definition

Amount of consideration transferred in asset acquisition. Includes, but is not limited to, cash, liability incurred by acquirer, and equity interest issued by acquirer.

+ References

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- Definition

Term of lessee's operating lease not yet commenced, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

Amount of operating lease expense. Excludes sublease income.

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Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

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Amount of lessee's right to use underlying asset under operating lease.

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- Definition

Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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