Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

+ Details

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Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
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Period Type:	instant

- Definition

Net fair value of all derivative instruments designated as cash flow hedging instruments, which is ordinarily reflected within other comprehensive income.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958

+ Details

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Period Type:	instant

- Definition

Date the derivative contract matures, in CCYY-MM-DD format.

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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Derivative Financial Instruments - Additional Information (Details) - 6 months ended Jul. 31, 2019	USD ($)	EUR (€)	CHF (SFr)	CNY (¥)	GBP (£)
Derivatives Fair Value [Line Items]
Cash flow hedges	$ 0
Foreign Exchange Forward
Derivatives Fair Value [Line Items]
Net forward contracts hedging portfolio	$ 29,000,000.0	€ 23,100,000	SFr 33,000,000.0	¥ 53,000,000.0	£ 1,100,000
Maximum
Derivatives Fair Value [Line Items]
Expiry dates ranging	Jan. 15, 2020