Business Combinations (Narrative) (Details) business in Thousands				3 Months Ended	12 Months Ended
	Apr. 30, 2019 USD ($) business	Jun. 01, 2017 USD ($)	Mar. 01, 2017 USD ($)	Nov. 30, 2019 USD ($)	Nov. 30, 2019 USD ($)	Nov. 30, 2018 USD ($)		Nov. 30, 2017 USD ($)
Business Acquisition [Line Items]
Goodwill				$ 432,824,000	$ 432,824,000	$ 314,992,000	[1]	$ 315,041,000
Share-based payment arrangement, expense					23,311,000	20,569,000		14,153,000
Acquisition-related expenses					1,658,000	258,000	[2]	1,458,000	[2]
Intangible assets				111,300,000	$ 111,300,000
Federal statutory income tax rate, percent					24.50%
Stock-based compensation					$ 23,311,000	20,569,000	[3]	14,153,000	[3]
Ipswitch
Business Acquisition [Line Items]
Total purchase consideration	$ 225,000,000.0
Escrow deposit	$ 22,500,000
Number of businesses acquired | business	24
Goodwill	$ 117,871,000
Kinvey, Inc.
Business Acquisition [Line Items]
Total purchase consideration		$ 49,200,000
Goodwill		$ 24,351,000
Acquisition-related expenses					0	300,000		1,100,000
Equity interests (as a percent)		100.00%
Purchase consideration, contingent consideration		$ 300,000
Period for founder to remain with company (at least)		2 years
DataRPM and Kinvey
Business Acquisition [Line Items]
Impairment of intangible assets				$ 22,700,000
DataRPM Corporation
Business Acquisition [Line Items]
Total purchase consideration			$ 30,000,000.0
Goodwill			$ 12,583,000
Acquisition-related expenses					$ 0	0		400,000
Equity interests (as a percent)			100.00%
Restricted Stock Units (RSUs)
Business Acquisition [Line Items]
Vesting period					3 years
Restricted Stock Units (RSUs) | Ipswitch
Business Acquisition [Line Items]
Consideration payable in the form of restricted stock units	$ 2,000,000.0
Vesting period	3 years
Remaining amortization period	3 years
Share-based payment arrangement, expense					$ 400,000
Acquisition-related expenses					1,700,000
Revenue of acquiree since acquisition date, actual					28,200,000
Restricted Stock Units (RSUs) | DataRPM Corporation
Business Acquisition [Line Items]
Consideration payable in the form of restricted stock units			$ 1,700,000
Vesting period			2 years
Stock-based compensation					$ 100,000	$ 100,000		$ 400,000
Term Loan | Ipswitch
Business Acquisition [Line Items]
Term loan	$ 185,000,000.0
Term loan and maximum borrowing capacity	401,000,000.0
Customer-related | Ipswitch
Business Acquisition [Line Items]
Intangible assets	66,600,000
Customer-related | Kinvey, Inc.
Business Acquisition [Line Items]
Intangible assets		$ 100,000
Customer-related | DataRPM Corporation
Business Acquisition [Line Items]
Intangible assets			$ 100,000
Purchased technology | Ipswitch
Business Acquisition [Line Items]
Intangible assets	33,100,000
Purchased technology | Kinvey, Inc.
Business Acquisition [Line Items]
Intangible assets		22,100,000
Purchased technology | DataRPM Corporation
Business Acquisition [Line Items]
Intangible assets			19,900,000
Trade name | Ipswitch
Business Acquisition [Line Items]
Intangible assets	$ 9,600,000
Trade name | Kinvey, Inc.
Business Acquisition [Line Items]
Intangible assets		$ 1,800,000
Trade name | DataRPM Corporation
Business Acquisition [Line Items]
Intangible assets			$ 800,000

[1] The Company adopted the accounting standard related to revenue recognition ("ASC 606") effective December 1, 2018 using the full retrospective method. See Note 1. Nature of Business and Summary of Significant Accounting Policies for further information.

[2] The Company adopted the accounting standard related to revenue recognition ("ASC 606") effective December 1, 2018 using the full retrospective method. See Note 1. Nature of Business and Summary of Significant Accounting Policies for further information.

[3] The Company adopted the accounting standard related to revenue recognition ("ASC 606") effective December 1, 2018 using the full retrospective method. See Note 1. Nature of Business and Summary of Significant Accounting Policies for further information.