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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Cash flows from operating activities
Net loss	$ (116,275)	$ (74,410)
Adjustments to reconcile net loss to net cash provided by (used in) operating activities:
Depreciation and amortization	61,165	38,664
Share-based compensation expenses	185,235	132,659
Amortization of deferred costs	20,880	16,360
Amortization of debt discount and issuance costs	11,587	18,139
Other	8,976	(9,289)
Changes in operating assets and liabilities:
Trade and other receivables, net	157,379	168,702
Deferred costs	(18,485)	(12,606)
Prepaid expenses and other assets	(5,107)	8,488
Accounts payable	1,503	7,954
Accrued expenses and other liabilities	21,403	11,627
Unearned revenue	(119,098)	(122,055)
Net cash provided by (used in) operating activities	209,163	184,233
Cash flows from investing activities
Purchases of marketable securities	(471,054)	(908,126)
Maturities of marketable securities	460,097	686,676
Sales of marketable securities	50,948	27,359
Owned real estate projects	(39,634)	(39,233)
Capital expenditures, excluding owned real estate projects	(65,535)	(48,862)
Purchases of non-marketable equity and other investments	(2,200)	(2,400)
Other	23	0
Net cash provided by (used in) investing activities	(67,355)	(284,586)
Cash flows from financing activities
Proceeds from issuance of common stock from employee equity plans	3,455	2,611
Other	(93)	(57)
Net cash provided by (used in) financing activities	3,362	2,554
Effect of exchange rate changes	(327)	(420)
Net increase (decrease) in cash, cash equivalents, and restricted cash	144,843	(98,219)
Cash, cash equivalents, and restricted cash at the beginning of period	642,203	1,135,654
Cash, cash equivalents, and restricted cash at the end of period	787,046	1,037,435
Supplemental cash flow data
Cash paid for interest, net of amounts capitalized	3	19
Cash paid for income taxes	3,534	1,714
Non-cash investing and financing activities:
Purchases of property and equipment, accrued but not paid	$ 77,429	$ 62,196

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Amount of cash inflow from issuance of shares under share-based compensation arrangement. Issuance includes, but is not limited to, exercise of stock options and similar instruments.

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Amount of cash inflow (outflow) from financing activities classified as other.

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The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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- Definition

Proceeds from Sale of Debt and Equity Securities, Available-for-sale

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