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Income Taxes (Reconciliation of Income Taxes Computed at Federal Statutory Income Tax Rate and Provision for (Benefit from) Income Taxes) (Detail)	12 Months Ended
	Jan. 31, 2019	Jan. 31, 2018	Jan. 31, 2017
Income Tax Disclosure [Abstract]
Federal statutory rate	21.00%	33.80%	35.00%
Effect of:
Foreign income at other than U.S. rates	(8.90%)	(26.50%)	(18.50%)
Intercompany transactions	3.70%	10.20%	4.20%
Research tax credits	12.60%	9.10%	6.40%
State taxes, net of federal benefit	(0.10%)	0.00%	0.00%
U.S. corporate tax rate reduction	0.00%	(81.30%)	0.00%
Changes in valuation allowance	(39.70%)	33.00%	(20.40%)
Stock compensation	12.70%	20.00%	(6.10%)
Other	0.00%	(0.40%)	(0.40%)
Total	1.30%	(2.10%)	0.20%

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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