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Restricted stock unit equal to number of common stock share.

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Share-based Compensation Arrangement by Share-based Payment Award, Award Market Condition Period

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

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Share-based Compensation Arrangement by Share-based Payment Award, Number of Plans for which Shareholder Approval Not Required

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Share-based Compensation Arrangement by Share-based Payment Award, Number of Shareholder Approved Stock Plans

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Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Shares Based on Cumulative Performance Condition

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Share-based Compensation Arrangement by Share-based Payment Award, Percentage of Shares Based on Market Condition of Total Shareholder Return

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Share-based Compensation Arrangement by Share-based Payment Award, Purchase Of Offering, Period

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Shares available and reserved for issuance under employee stock purchase plan

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Unrecognized cost of unvested share-based compensation awards.

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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.

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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.

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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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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.

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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).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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

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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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Purchase price of common stock expressed as a percentage of its fair value.

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Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Feb. 28, 2018 metric	Aug. 31, 2018	Nov. 30, 2018 USD ($) period plan $ / shares shares	Nov. 30, 2017 USD ($) $ / shares Executives shares	Nov. 30, 2016 USD ($) $ / shares Executives shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shareholder approved stock plans \| plan			1
Number of plans for which shareholder approval not required \| plan			2
Unrecognized stock-based compensation expense, net of expected forfeitures \| $			$ 28.6
Costs are expected to be recognized, weighted average period			2 years 1 month 6 days
Number of executives whose employment was terminated \| Executives				3	2
Additional stock-based compensation expenses related to separation and acceleration vesting \| $				$ 1.5	$ 0.3
2008 Stock Option And Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issuable under stock plans (in shares)			54,510,000
Shares available for grant under stock plans (in shares)			2,537,256
2002 Nonqualified Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issuable under stock plans (in shares)			9,750,000
Shares available for grant under stock plans (in shares)			650,169
2004 Inducement Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issuable under stock plans (in shares)			1,500,000
Shares available for grant under stock plans (in shares)			583,021
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional stock-based compensation expenses related to separation and acceleration vesting \| $				0.8	0.2
Product development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional stock-based compensation expenses related to separation and acceleration vesting \| $				$ 0.7	$ 0.1
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			1 year
Weighted average estimated fair value of options granted, per share (in dollars per share) \| $ / shares			$ 10.30	$ 5.95	$ 0.00
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period			3 years
Number of common stock shares each restricted stock unit represents (in shares)			1
Stock-based compensation service period			3 years	3 years	3 years
Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation service period	3 years	3 years
Number of performance metrics \| metric	2
Percentage of shares based on market conditions	50.00%
Market condition period		3 years
Percentage of shares based on cumulative performance condition	50.00%
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issuable under stock plans (in shares)			9,450,000
ESPP offering period			27 months
ESPP number of purchase periods \| period			9
ESPP purchase period			3 years
ESPP purchase price (as a percent)			85.00%
Employee stock purchase plan, issued shares (in shares)			225,000	220,000	266,000
Weighted average purchase price of shares (in dollars per share) \| $ / shares			$ 24.27	$ 22.27	$ 20.01
Shares available and reserved for issuance (in shares)			590,000
Weighted average estimated fair value of options granted, per share (in dollars per share) \| $ / shares			$ 10.24	$ 8.32	$ 7.43