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Convertible Senior Notes, Net (Detail)	3 Months Ended	6 Months Ended	12 Months Ended
	Jul. 31, 2018 USD ($) shares	Jan. 31, 2019 USD ($) $ / shares shares	Jan. 31, 2019 USD ($) day trading_day $ / shares shares	Jan. 31, 2018 USD ($)	Jan. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2013 USD ($)
Debt Instrument [Line Items]
Purchase of convertible senior notes hedges			$ 0	$ 175,530,000	$ 0
Threshold consecutive trading days | trading_day			30
Number of days out of thirty that common stock price exceeded conversion price | day			20
Interest costs capitalized			$ 11,000,000	8,000,000	3,000,000
Proceeds from sale of warrants			$ 0	80,805,000	0
2018 Notes
Debt Instrument [Line Items]
Contractual interest rate		0.75%	0.75%				0.75%
Convertible Senior Notes, principal amount		$ 0	$ 0	350,000,000			$ 350,000,000.0
Repayments of debt	$ 350,000,000
Debt issuance costs		$ 7,000,000	7,000,000
Equity issuance costs			2,000,000
Amortization expense for debt issuance costs			$ 641,000	1,409,000	1,408,000
Effective interest rates of the liability components, percentage		5.75%	5.75%
2018 Notes | Class A Common Stock
Debt Instrument [Line Items]
Shares issued (in shares) | shares	1,500,000
Initial conversion price (in dollars per share) | $ / shares		$ 83.28	$ 83.28
Settlement of convertible senior notes (in shares) | shares	1,500,000
Indexed shares (in shares) | shares		4,200,000	4,200,000
2020 Notes
Debt Instrument [Line Items]
Contractual interest rate		1.50%	1.50%				1.50%
Convertible Senior Notes, principal amount		$ 249,975,000	$ 249,975,000	250,000,000			$ 250,000,000.0
Threshold percentage of conversion price			130.00%
Debt issuance costs		$ 5,000,000	$ 5,000,000
Equity issuance costs			2,000,000
Amortization expense for debt issuance costs			$ 673,000	673,000	675,000
Remaining life of the notes, months			17 months
Effective interest rates of the liability components, percentage		6.25%	6.25%
2020 Notes | Class A Common Stock
Debt Instrument [Line Items]
Debt instrument, convertible, number of shares | shares			12.2340
Initial conversion price (in dollars per share) | $ / shares		$ 81.74	$ 81.74
Indexed shares (in shares) | shares		3,100,000	3,100,000
2022 Notes
Debt Instrument [Line Items]
Contractual interest rate		0.25%	0.25%			0.25%
Convertible Senior Notes, principal amount		$ 1,150,000,000	$ 1,150,000,000	1,150,000,000		$ 1,150,000,000.00
Purchase of convertible senior notes hedges			176,000,000
Debt issuance costs		$ 14,000,000	14,000,000
Equity issuance costs			4,000,000
Amortization expense for debt issuance costs			$ 2,858,000	$ 1,080,000	$ 0
Remaining life of the notes, months			44 months
Effective interest rates of the liability components, percentage		4.60%	4.60%
Proceeds from sale of warrants			$ 81,000,000
2022 Notes | Class A Common Stock
Debt Instrument [Line Items]
Debt instrument, convertible, number of shares | shares			6.7982
Initial conversion price (in dollars per share) | $ / shares		$ 147.10	$ 147.10
Indexed shares (in shares) | shares		7,800,000	7,800,000
Convertible Senior Notes
Debt Instrument [Line Items]
Repurchase of notes percentage			100.00%
Convertible Senior Notes | Debt Conversion, Option One
Debt Instrument [Line Items]
Threshold trading days (in trading days) | trading_day			20
Threshold consecutive trading days | trading_day			30
Threshold percentage of conversion price			130.00%
Convertible Senior Notes | Debt Conversion, Option Two
Debt Instrument [Line Items]
Threshold consecutive trading days | trading_day			5
Threshold business days | trading_day			5
Convertible Senior Notes | Debt Conversion, Option Two | Maximum
Debt Instrument [Line Items]
Threshold percentage of conversion price			98.00%
FaceValuePerNote
Debt Instrument [Line Items]
Convertible Senior Notes, principal amount		$ 1,000	$ 1,000
Notes 2018 and 2020
Debt Instrument [Line Items]
Purchase of convertible senior notes hedges			144,000,000
Proceeds from sale of warrants			$ 93,000,000
Warrants Expires in October 2018
Debt Instrument [Line Items]
Shares covered by each purchased option/warrant, shares | shares		4,200,000	4,200,000
Trading days			60 days
Exercise price of warrants, dollars per share | $ / shares		$ 107.96	$ 107.96
Warrants Expires In October 2020
Debt Instrument [Line Items]
Shares covered by each purchased option/warrant, shares | shares		3,100,000	3,100,000
Trading days			60 days
Exercise price of warrants, dollars per share | $ / shares		$ 107.96	$ 107.96
Warrants Expires In January 2023
Debt Instrument [Line Items]
Shares covered by each purchased option/warrant, shares | shares		7,800,000	7,800,000
Trading days			60 days
Exercise price of warrants, dollars per share | $ / shares		$ 213.96	$ 213.96
Warrants Expires in July 2018
Debt Instrument [Line Items]
Aggregate amount paid for Purchased Options		$ 0	$ 0
Warrants Expires in July 2018 | Class A Common Stock
Debt Instrument [Line Items]
Shares issued (in shares) | shares		1,100,000

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