Percentage points added to the reference rate to compute the variable rate on the debt instrument.

No definition available.

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Namespace Prefix:	us-gaap_
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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Balance Type:	na
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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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Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Percentage added to Eurodollar base rate before margin.

+ References

No definition available.

+ Details

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Namespace Prefix:	var_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of voting rights pledged.

+ References

No definition available.

+ Details

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Namespace Prefix:	var_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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BORROWINGS - Additional Information (Detail)	3 Months Ended
BORROWINGS - Additional Information (Detail)	Jan. 01, 2016 JPY (¥)	Jan. 01, 2016 USD ($)	Nov. 30, 2015 USD ($)	Aug. 27, 2013 USD ($)
Sumitomo Credit Facility
Line Of Credit Facility [Line Items]
Loan facility, maximum borrowing capacity \| ¥	¥ 3,000,000,000
Line of credit, interest rate (as a percent)	0.50%
Amended 2013 Credit Facility
Line Of Credit Facility [Line Items]
Percentage of voting rights pledged	65.00%
Amended 2013 Credit Facility \| 2013 Revolving Credit Facility
Line Of Credit Facility [Line Items]
Credit facility term (in years)	5 years
Loan facility, maximum borrowing capacity		$ 500,000,000	$ 500,000,000	$ 300,000,000
Amended 2013 Credit Facility \| 2013 Revolving Credit Facility \| Minimum
Line Of Credit Facility [Line Items]
Expiration period (in months)	30 days
Amended 2013 Credit Facility \| 2013 Revolving Credit Facility \| Letter of Credit
Line Of Credit Facility [Line Items]
Loan facility, maximum borrowing capacity		50,000,000
Amended 2013 Credit Facility \| 2013 Revolving Credit Facility \| Swing Line Loans
Line Of Credit Facility [Line Items]
Loan facility, maximum borrowing capacity		25,000,000
Amended 2013 Credit Facility \| 2013 Term Loan Facility
Line Of Credit Facility [Line Items]
Credit facility term (in years)	5 years
Loan facility, maximum borrowing capacity		$ 500,000,000
Amended 2013 Credit Facility \| Eurodollar \| 2013 Revolving Credit Facility \| Minimum
Line Of Credit Facility [Line Items]
Line of credit, interest rate (as a percent)	1.125%
Amended 2013 Credit Facility \| Eurodollar \| 2013 Revolving Credit Facility \| Maximum
Line Of Credit Facility [Line Items]
Line of credit, interest rate (as a percent)	1.375%
Amended 2013 Credit Facility \| Eurodollar \| 2013 Term Loan Facility \| Minimum
Line Of Credit Facility [Line Items]
Line of credit, interest rate (as a percent)	0.875%
Amended 2013 Credit Facility \| Eurodollar \| 2013 Term Loan Facility \| Maximum
Line Of Credit Facility [Line Items]
Line of credit, interest rate (as a percent)	1.125%
Amended 2013 Credit Facility \| Federal Funds Effective Swap Rate \| 2013 Revolving Credit Facility
Line Of Credit Facility [Line Items]
Line of credit, interest rate (as a percent)	0.50%
Amended 2013 Credit Facility \| Federal Funds Effective Swap Rate \| 2013 Term Loan Facility
Line Of Credit Facility [Line Items]
Line of credit, interest rate (as a percent)	0.50%
Amended 2013 Credit Facility \| Eurodollar1 \| 2013 Revolving Credit Facility
Line Of Credit Facility [Line Items]
Percentage added to Eurodollar base rate before margin (as a percent)	1.00%
Amended 2013 Credit Facility \| Eurodollar1 \| 2013 Revolving Credit Facility \| Minimum
Line Of Credit Facility [Line Items]
Line of credit, interest rate (as a percent)	0.125%
Amended 2013 Credit Facility \| Eurodollar1 \| 2013 Revolving Credit Facility \| Maximum
Line Of Credit Facility [Line Items]
Line of credit, interest rate (as a percent)	0.375%
Amended 2013 Credit Facility \| Eurodollar1 \| 2013 Term Loan Facility
Line Of Credit Facility [Line Items]
Percentage added to Eurodollar base rate before margin (as a percent)	1.00%
Amended 2013 Credit Facility \| Eurodollar1 \| 2013 Term Loan Facility \| Maximum
Line Of Credit Facility [Line Items]
Line of credit, interest rate (as a percent)	0.125%