Unrecognized cost of unvested share-based compensation awards.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (i)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Number of Performance Periods

+ References

No definition available.

+ Details

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- Definition

Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Counted Against Available-For-Grant Limit for Every One Share Awarded

+ References

No definition available.

+ Details

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Namespace Prefix:	var_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Performance Period

+ References

No definition available.

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Employee Stock Plans - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended	0 Months Ended
	Apr. 03, 2015	Sep. 26, 2014 performance_period	Feb. 08, 2012
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares counted against the available for grant			2.5
Stock options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense related to outstanding stock awards	$ 16.4
Weighted average period unrecognized compensation expense is expected to be recognized, years	1 year 9 months 18 days
Restricted stocks, restricted stock units, deferred stock units and performance units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense related to outstanding stock awards	$ 54.9
Weighted average period unrecognized compensation expense is expected to be recognized, years	2 years
Third Amended and Restated 2005 Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares counted against the available for grant	2.6
Third Amended and Restated 2005 Plan \| Performance units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award service period	3 years
Number of performance periods		1
Performance period term		3 years
Third Amended and Restated 2005 Plan \| Performance units, company performance
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period term	1 year
Third Amended and Restated 2005 Plan \| Performance units, total shareholder return performance
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period term	3 years