Financial Instruments - Cash Equivalents, Marketable Securities and Restricted Cash (Details) - USD ($) $ in Thousands	Oct. 31, 2021	Jan. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 958,180
Cash Equivalents	13,795	$ 54,780
Marketable securities	958,180	916,388
Restricted Cash	10,544	10,544
Amortized Cost	956,677	922,507
Total gross unrealized gains	3,072	9,255
Total gross unrealized losses	(1,569)	(34)
Total fair value	982,519	981,712
Level 1 \| Money market accounts
Debt Securities, Available-for-sale [Line Items]
Fair Value	24,339	49,984
Cash Equivalents	13,795	39,440
Marketable securities	0	0
Restricted Cash	10,544	10,544
Level 2 \| U.S. government treasury notes
Debt Securities, Available-for-sale [Line Items]
Total	335,607	339,253
Gross Unrealized Gains	1,250	3,241
Gross Unrealized Losses	(417)	(1)
Fair Value	336,440	342,493
Cash Equivalents	0	15,340
Marketable securities	336,440	327,153
Restricted Cash	0	0
Level 2 \| U.S. government agencies
Debt Securities, Available-for-sale [Line Items]
Total	50,147	56,729
Gross Unrealized Gains	170	516
Gross Unrealized Losses	(21)	0
Fair Value	50,296	57,245
Cash Equivalents	0	0
Marketable securities	50,296	57,245
Restricted Cash	0	0
Level 2 \| Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Total	484,325	425,115
Gross Unrealized Gains	1,263	4,176
Gross Unrealized Losses	(950)	(33)
Fair Value	484,638	429,258
Cash Equivalents	0	0
Marketable securities	484,638	429,258
Restricted Cash	0	0
Level 2 \| Foreign government bonds
Debt Securities, Available-for-sale [Line Items]
Total	14,885	21,486
Gross Unrealized Gains	112	307
Gross Unrealized Losses	(6)	0
Fair Value	14,991	21,793
Cash Equivalents	0	0
Marketable securities	14,991	21,793
Restricted Cash	0	0
Level 2 \| Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Total	69,273	79,924
Gross Unrealized Gains	277	1,015
Gross Unrealized Losses	(160)	0
Fair Value	69,390	80,939
Cash Equivalents	0	0
Marketable securities	69,390	80,939
Restricted Cash	0	$ 0
Level 2 \| Municipal bonds
Debt Securities, Available-for-sale [Line Items]
Total	2,440
Gross Unrealized Gains	0
Gross Unrealized Losses	(15)
Fair Value	2,425
Cash Equivalents	0
Marketable securities	2,425
Restricted Cash	$ 0

Debt Securities, Available-for-sale, Cash Equivalents And Restricted Cash

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Debt Securities, Available-for-sale, Cash Equivalents And Restricted Cash, Accumulated Gross Unrealized Gain, Before Tax

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Debt Securities, Available-for-sale, Cash Equivalents And Restricted Cash, Accumulated Gross Unrealized Loss, Before Tax

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Debt Securities, Available-for-sale, Cash Equivalents And Restricted Cash, Amortized Cost

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount of 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. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amortized cost excluding accrued interest, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Amount excluding accrued interest, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

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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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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