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Selected Quarterly Financial Data (unaudited) (Consolidated Statements of Operations Data) (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Consolidated Statements of Operations Data:
Total revenues	$ 788,628	$ 743,189	$ 671,720	$ 618,643	$ 582,480	$ 555,389	$ 525,320	$ 479,861	$ 2,822,180	$ 2,143,050	$ 1,574,440
Operating loss	(120,283)	(182,755)	(88,982)	(71,264)	(81,335)	(80,059)	(81,629)	(60,200)	(463,284)	(303,223)	(353,086)
Net loss	$ (104,361)	$ (153,331)	$ (86,156)	$ (74,410)	$ (89,100)	$ (85,546)	$ (82,532)	$ (64,044)	$ (418,258)	$ (321,222)	$ (384,699)
Net loss per share, basic and diluted (dollars per share)	$ (0.47)	$ (0.70)	$ (0.40)	$ (0.35)	$ (0.42)	$ (0.41)	$ (0.40)	$ (0.31)	$ (1.93)	$ (1.55)	$ (1.94)

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The amount of net income or loss for the period per each share in instances when basic and diluted earnings per share are the same amount and reported as a single line item on the face of the financial statements. Basic earnings per share is the amount of net income or loss for the period per each share of common stock or unit outstanding during the reporting period. Diluted earnings per share includes the amount of net income or loss for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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