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Description of Business and Basis of Presentation - Additional Information (Details) - USD ($)
$ in Thousands

3 Months Ended

9 Months Ended

12 Months Ended

Oct. 31, 2019

Oct. 31, 2018

Oct. 31, 2019

Oct. 31, 2018

Jan. 31, 2019

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Operating lease right-of-use assets

^[1]

$ 203,926

$ 203,926

Operating lease liabilities

^[2]

253,704

253,704

Non-current portion of operating lease liabilities

^[1]

213,369

213,369

Finance leases liabilities

131,943

131,943

Non-current portion of the additional finance lease liabilities

82,637

^[1]

82,637

^[1]

$ 44,597

^[3]

Accounting Standards Update 2016-02

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Operating lease right-of-use assets

206,600

206,600

Operating lease liabilities

255,000

255,000

Non-current portion of operating lease liabilities

218,600

218,600

Finance lease right-of-use assets

5,200

5,200

Finance leases liabilities

5,200

5,200

Non-current portion of the additional finance lease liabilities

$ 2,900

$ 2,900

Credit Concentration Risk | Accounts Receivable

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Number of major customers

one

one

Concentration risk percentage

10.00%

10.00%

Customer Concentration Risk | Revenue

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Number of major customers

One

One

One

One

Concentration risk percentage

10.00%

12.00%

10.00%

12.00%

Geographic Concentration Risk | Revenue | United States

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Concentration risk percentage

75.00%

75.00%

75.00%

76.00%

Geographic Concentration Risk | Revenue | Japan

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Concentration risk percentage

10.00%

Geographic Concentration Risk | Property and Equipment | United States

Organization Consolidation And Presentation Of Financial Statements [Line Items]

Concentration risk percentage

94.00%

91.00%

[1]	As reported and disclosed under ASC Topic 842
[2]	Non-cancellable sublease proceeds for the remainder of the fiscal year ending January 31, 2020 and the fiscal years ending January 31, 2021, 2022, and 2023 of $1.4 million, $9.5 million, $7.1 million, and $6.1 million, respectively, are not included in the table above.
[3]	As reported and disclosed under ASC Topic 840

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