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Summary of Significant Accounting Policies Recently Issued Accounting Standards (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jan. 31, 2018	Jan. 31, 2018	Jan. 31, 2017	Jul. 31, 2019	Jul. 31, 2018
Impact of Tax Reform		$ 64,600
Impact of Excess Tax Benefits on EPS	$ 0.03	$ 1.27
Excess Tax Benefit from Share-based Compensation, Operating Activities	$ 1,277	$ 53,081	$ 7,296
Issuance of shares under share award plans, net of shares withheld for employee taxes		$ 71,675	$ 12,975
Scenario, Forecast [Member]
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent				21.00%	27.00%

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Impact of Excess Tax Benefits on EPS

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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-URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319

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Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 20
-Section 55
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Value of stock (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of stock value of such awards forfeited. Stock issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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