Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
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Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
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-Paragraph 2
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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, 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
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-SubTopic 10
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-Paragraph 2
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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.

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- Definition

Gross number of share options (or share units) granted during the period.

+ References

No definition available.

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- Definition

The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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-Paragraph 2
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- Definition

Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

+ References

No definition available.

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- Definition

Price of a single share of a number of saleable stocks of a company.

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STOCK BASED COMPENSATION - Stock Options (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended
	Nov. 01, 2016	Jul. 26, 2016	Jan. 31, 2017	Jan. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 4.0	$ 1.0
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option grants (in shares)			9,000
Exercised (in shares)			$ 9.69
Stock-based compensation expense			$ 0.4	$ 0.0
Compensation costs not yet recognized			1.6
Stock Options \| EBITDA Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs not yet recognized			$ 5.9
IPO \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option grants (in shares)		1,145,338
Share price (in USD per share)		$ 21.00
Estimate fair value of stock options (in USD per share))		$ 8.29
IPO \| Stock Options \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option grants (in shares)		431,052
Vesting period		3 years
Management \| IPO \| Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock option grants (in shares)	9,000
Share price (in USD per share)	$ 9.69
Exercised (in shares)	$ 25.61