v3.7.0.1

Convertible Senior Notes, Net (Detail) $ / shares in Units, shares in Millions	3 Months Ended
	Apr. 30, 2017 USD ($) trading_day $ / shares shares	Apr. 30, 2016 USD ($)	Jan. 31, 2017 USD ($)	Jun. 30, 2013 USD ($)
2018 Notes
Debt Instrument [Line Items]
Contractual interest rate	0.75%			0.75%
Convertible senior notes, principal amount	$ 350,000,000		$ 350,000,000	$ 350,000,000
Liability issuance costs	7,000,000
Equity issuance costs	2,000,000
Amortization expense for liability issuance costs	$ 352,000	$ 352,000
Remaining life of the Notes	14 months
Effective interest rates of the liability components	5.75%
2020 Notes
Debt Instrument [Line Items]
Contractual interest rate	1.50%			1.50%
Convertible senior notes, principal amount	$ 250,000,000		$ 250,000,000	$ 250,000,000
Liability issuance costs	5,000,000
Equity issuance costs	2,000,000
Amortization expense for liability issuance costs	$ 168,000	$ 167,000
Remaining life of the Notes	38 months
Effective interest rates of the liability components	6.25%
Shares related to the convertible senior notes
Debt Instrument [Line Items]
Repurchase of notes percentage	100.00%
Exercise price of warrants (in dollars per share) | $ / shares	$ 107.96
Proceeds from sale of warrants	$ 93,000,000
Shares related to the convertible senior notes | Employee Stock Option
Debt Instrument [Line Items]
Shares covered by each purchased options or warrants (in shares) | shares	7.3
Aggregate amount for Purchased Options	$ 144,000,000
Warrants expires in July 2018
Debt Instrument [Line Items]
Shares covered by each purchased options or warrants (in shares) | shares	4.2
Warrants expires in July 2020
Debt Instrument [Line Items]
Shares covered by each purchased options or warrants (in shares) | shares	3.1
Class A | 2018 Notes
Debt Instrument [Line Items]
Initial conversion rate	12.0075
Principal amount converted into Class A Common Stock	$ 1,000
Initial conversion price (in dollars per share) | $ / shares	$ 83.28
Class A | 2020 Notes
Debt Instrument [Line Items]
Initial conversion rate	12.2340
Principal amount converted into Class A Common Stock	$ 1,000
Initial conversion price (in dollars per share) | $ / shares	$ 81.74
Debt Conversion, Option One | Shares related to the convertible senior notes
Debt Instrument [Line Items]
Threshold trading days (in trading days) | trading_day	20
Threshold consecutive trading days	30 days
Threshold percentage of conversion price	130.00%
Debt Conversion, Option Two | Shares related to the convertible senior notes
Debt Instrument [Line Items]
Threshold trading days (in trading days) | trading_day	5
Threshold consecutive trading days	5 days
Debt Conversion, Option Two | Shares related to the convertible senior notes | Maximum
Debt Instrument [Line Items]
Threshold percentage of conversion price	98.00%

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