Stock-Based Compensation (Narrative) (Details) $ / shares in Units, $ in Millions	3 Months Ended				12 Months Ended
	Feb. 28, 2022 metric	Feb. 28, 2021 metric	Feb. 29, 2020 metric	Feb. 28, 2019	Nov. 30, 2022 USD ($) plan period $ / shares shares	Nov. 30, 2021 $ / shares shares	Nov. 30, 2020 $ / shares shares	May 31, 2021 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 | $					$ 45.8
Costs are expected to be recognized, weighted average period					2 years
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					$ 10.95	$ 9.46	$ 9.59
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
Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of performance metrics | metric	2	2	2
Stock-based compensation service period	3 years	3 years		3 years
Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issuable under stock plans (in shares)					10,250,000
ESPP offering period					27 months
ESPP number of purchase periods | period					9
ESPP purchase period					3 months
ESPP purchase price (as a percent)					85.00%
Employee stock purchase plan, issued shares (in shares)					301,000	277,000	237,000
Weighted average purchase price of shares (in dollars per share) | $ / shares					$ 30.59	$ 28.20	$ 27.86
Shares available and reserved for issuance (in shares)					386,000
Additional holding period					3 months
Weighted average estimated fair value of options granted, per share (in dollars per share) | $ / shares					$ 11.01	$ 11.59	$ 8.73
2008 Stock Option and Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issuable under stock plans (in shares)								4,500,000
Shares available for grant under stock plans (in shares)					4,719,864
2002 Nonqualified Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant under stock plans (in shares)					56,093
2004 Inducement Stock Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant under stock plans (in shares)					466,716
2020 Plan | Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares based on market conditions			50.00%
Cumulative performance condition			3 years
Percentage of shares based on cumulative performance condition			50.00%
2021 Plan | Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares based on market conditions						25.00%
Cumulative performance condition						3 years
Percentage of shares based on cumulative performance condition						75.00%
Market condition period						3 years
2022 Plan | Long-Term Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of shares based on market conditions					25.00%
Cumulative performance condition					3 years
Percentage of shares based on cumulative performance condition					75.00%
Market condition period					3 years