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Commitments and Contingencies - Narrative (Details) - USD ($)	3 Months Ended			12 Months Ended
	Jul. 31, 2018	Jul. 31, 2017		Jan. 31, 2018	Jan. 31, 2017	Jun. 30, 2018
Other Commitments [Line Items]
Deferred rent	$ 30,500,000			$ 5,500,000
Rent expense	5,800,000	$ 2,500,000		9,200,000	$ 4,700,000
Letters of credit issued and outstanding	12,500,000			$ 12,200,000
Restricted cash	8,560,000	$ 279,000	[1]
Letter of Credit
Other Commitments [Line Items]
Draws on line of credit	0
San Francisco - Ten Year Lease
Other Commitments [Line Items]
Restricted cash	$ 8,000,000
Financial Standby Letter of Credit
Other Commitments [Line Items]
Standby letter of credit						$ 3,000,000
[1] See Note 2 for a summary of adjustments.

X

- Definition

The cumulative difference between the rental payments required by a lease agreement and the rental income or expense recognized on a straight-line basis, or other systematic and rational basis more representative of the time pattern in which use or benefit is granted or derived from the leased property, expected to be recognized in income or expense over the term of the leased property by the lessor or lessee, respectively.

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The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount of cash and cash equivalents restricted as to withdrawal or usage, classified as noncurrent. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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