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Income Taxes (Summary of Reconciliation of Gross Unrecognized Tax Benefit) (Detail) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits at the beginning of the period	$ 107,849	$ 116,801	$ 98,460
Additions for tax positions taken in prior years	10,586	1,500	3,981
Reductions for tax positions taken in prior years	0	(8,121)	0
Decrease for tax positions taken in prior years due to federal rate reduction	0	(10,062)	0
Additions for tax positions related to the current year	12,336	7,731	14,475
Reductions related to a lapse of applicable statute of limitations	0	0	(115)
Unrecognized tax benefits at the end of the period	$ 130,771	$ 107,849	$ 116,801

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of unrecognized tax benefits.

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-Name Accounting Standards Codification
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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of increase (decrease) in unrecognized tax benefits attributable to uncertain tax positions taken in tax returns.

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