Allocated Share-based Compensation Expense, Potential Accrual

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Additional Service Period

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No definition available.

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- Definition

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

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Award, Weighted Average Vesting Period

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No definition available.

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- Definition

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.

+ References

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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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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
-Section 50
-Paragraph 2
-Subparagraph (i)
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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.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ 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 (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-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

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

+ 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

The weighted average of per share prices paid for shares purchased on the open market for issuance to employees under the plan.

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

Number of share instruments newly issued under a share-based compensation plan.

+ References

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- Definition

Percentage of vesting of share-based compensation awards.

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STOCK COMPENSATION PLANS - Additional Information (Details) - USD ($)			3 Months Ended		6 Months Ended		18 Months Ended
	Feb. 09, 2017	Nov. 01, 2016	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based compensation expense			$ 4,400,000	$ 3,700,000	$ 10,600,000	$ 9,400,000
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based compensation expense			$ 1,900,000	1,700,000	$ 3,900,000	3,400,000
Aggregate number of shares outstanding (in shares)			282,156		282,156		282,156
Unrecognized share-based compensation costs			$ 14,900,000		$ 14,900,000		$ 14,900,000
Weighted average vesting period					2 years
Restricted Stock \| Outside Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of restricted stock granted (in shares)	11,400
Grant date fair value of restricted shares (in usd per share)	$ 131.61
Restricted Stock \| Outside Directors \| Scenario One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	1 year
Restricted Stock \| Outside Directors \| Scenario Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	2 years
Restricted Stock \| Outside Directors \| Scenario Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period	3 years
Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based compensation expense			2,347,000	1,902,000	$ 6,519,000	5,827,000
Performance period (in years)					2 years
Additional service period					1 year
Management Share Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based compensation expense			$ 103,000	138,000	$ 165,000	198,000
Management Share Purchase Plan \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued (in shares)					6,617
Average price per share purchased by participants (in usd per share)			$ 135.27		$ 135.27		$ 135.27
Management Share Purchase Plan \| Matching Restricted Shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued (in shares)					1,592
Performance Share Plan 2017 \| Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based compensation expense			$ 0	0	$ 0	0
Target number of common stock to be granted (in shares)		53,850
Aggregate number of shares outstanding (in shares)			0		0		0
Performance Share Plan 2017 \| Performance Based Awards \| Officers And Key Management Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares of restricted stock granted (in shares)		53,850
Grant date fair value of restricted shares (in usd per share)		$ 148.23
Performance Share Plan 2016 \| Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based compensation expense			$ 1,519,000	0	$ 4,845,000	0
Aggregate number of shares outstanding (in shares)			105,765		105,765		105,765
Performance Share Plan 2015 \| Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock based compensation expense			$ 828,000	$ 1,193,000	$ 1,674,000	$ 4,484,000
Additional service period					1 year
Aggregate number of shares outstanding (in shares)			145,469		145,469		145,469
Potential accrued compensation cost					$ 2,600,000		$ 1,200,000
Minimum \| Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of potential performance shares received					50.00%
Maximum \| Performance Based Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of potential performance shares received					200.00%