Condensed consolidated statements of cash flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jul. 31, 2019	Jul. 31, 2018
Cash flows from operating activities:
Net income	$ 61,188	$ 45,094
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	9,722	8,916
Unrealized (gains) losses on marketable equity securities and other	(27,180)	86
Deferred taxes	7,868	2,351
Stock-based compensation	13,618	9,727
Changes in operating assets and liabilities:
Accounts receivable	(1,689)	(3,304)
Other assets	(5,036)	(6,921)
Operating lease right-of-use assets	1,286
Accounts payable	(1,083)	(837)
Accrued compensation	(5,926)	(2,826)
Accrued liabilities and other current liabilities	4,942	56
Operating lease liabilities, non-current	(1,210)
Other long-term liabilities	331	298
Net cash provided by operating activities	56,831	52,640
Cash flows from investing activities:
Purchases of intangible member assets	(1,736)	(1,014)
Purchases of marketable equity securities and other	(53,845)	(368)
Purchases of property and equipment	(3,492)	(2,690)
Purchases of software and capitalized software development costs	(9,518)	(4,701)
Net cash used in investing activities	(68,591)	(8,773)
Cash flows from financing activities:
Proceeds from follow-on equity offering, net of payments for offering costs	458,881	0
Proceeds from exercise of common stock options	6,564	18,469
Net cash provided by financing activities	465,445	18,469
Increase in cash and cash equivalents	453,685	62,336
Beginning cash and cash equivalents	361,475	199,472
Ending cash and cash equivalents	815,160	261,808
Supplemental cash flow data:
Interest expense paid in cash	101	101
Income taxes paid in cash, net of refunds received	9,119	554
Supplemental disclosures of non-cash investing and financing activities:
Purchases of property and equipment included in accounts payable or accrued liabilities at period end	3	14
Exercise of common stock options receivable	87	135
Follow-on equity offering costs accrued during the period	386	0
Debt issuance costs accrued during the period	345	0
Software
Supplemental disclosures of non-cash investing and financing activities:
Purchases of intangible assets	487	175
Intangible member assets
Supplemental disclosures of non-cash investing and financing activities:
Purchases of intangible assets	$ 6,500	$ 181