Business Combinations (Schedule of Net Assets Acquired) (Details) - USD ($) $ in Thousands				12 Months Ended		13 Months Ended	14 Months Ended
	Nov. 01, 2021	Oct. 05, 2020	Apr. 30, 2019	Nov. 30, 2021	Nov. 30, 2020	May 30, 2020	Nov. 30, 2021	May 31, 2020	Nov. 30, 2019
Business Acquisition [Line Items]
Goodwill				$ 671,152	$ 491,726		$ 671,152		$ 432,824
Measurement Period Adjustments
Goodwill				77	$ 838
Kemp Acquisition
Business Acquisition [Line Items]
Net working capital	$ 27,075
Property, plant and equipment	803
Intangible assets				122,100			122,100
Other assets	170
Other noncurrent liabilities	(604)
Deferred taxes	(23,187)
Deferred revenue	(29,997)
Goodwill	179,521
Net assets acquired	275,881
Kemp Acquisition | Purchased technology
Business Acquisition [Line Items]
Intangible assets	$ 39,400
Measurement Period Adjustments
Finite-lived intangible assets, useful life	5 years
Kemp Acquisition | Trade name
Business Acquisition [Line Items]
Intangible assets	$ 7,200
Measurement Period Adjustments
Finite-lived intangible assets, useful life	5 years
Kemp Acquisition | Customer relationships
Business Acquisition [Line Items]
Intangible assets	$ 75,500
Measurement Period Adjustments
Finite-lived intangible assets, useful life	5 years
Chef acquisition
Business Acquisition [Line Items]
Net working capital		$ 52,330		52,477			52,477
Property, plant and equipment		498		498			498
Intangible assets				141,300			141,300
Other assets		122		122			122
Other noncurrent liabilities		(841)		(841)			(841)
Lease liabilities, net		(1,810)		(1,810)			(1,810)
Deferred taxes		(7,817)		(7,691)			(7,691)
Deferred revenue		(12,525)		(12,525)			(12,525)
Goodwill		59,858		59,585			59,585
Net assets acquired		231,115		231,115			231,115
Measurement Period Adjustments
Net working capital							147
Deferred taxes							126
Goodwill							273
Net assets acquired							0
Chef acquisition | Purchased technology
Business Acquisition [Line Items]
Intangible assets		$ 38,300		38,300			38,300
Measurement Period Adjustments
Finite-lived intangible assets, useful life		5 years
Chef acquisition | Trade name
Business Acquisition [Line Items]
Intangible assets		$ 5,700		5,700			5,700
Measurement Period Adjustments
Finite-lived intangible assets, useful life		5 years
Chef acquisition | Customer relationships
Business Acquisition [Line Items]
Intangible assets		$ 97,300		$ 97,300			$ 97,300
Measurement Period Adjustments
Finite-lived intangible assets, useful life		7 years
Ipswitch
Business Acquisition [Line Items]
Net working capital			$ 6,068					$ 6,719
Property, plant and equipment			4,661					4,661
Other assets			314					310
Deferred revenue			(12,696)					(12,725)
Goodwill			117,651					117,033
Net assets acquired			225,298					225,298
Measurement Period Adjustments
Net working capital						$ 651
Other assets						(4)
Deferred revenue						(29)
Goodwill						618
Net assets acquired						$ 0
Ipswitch | Purchased technology
Business Acquisition [Line Items]
Intangible assets			$ 33,100					33,100
Measurement Period Adjustments
Finite-lived intangible assets, useful life			5 years
Ipswitch | Trade name
Business Acquisition [Line Items]
Intangible assets			$ 9,600					9,600
Measurement Period Adjustments
Finite-lived intangible assets, useful life			5 years
Ipswitch | Customer relationships
Business Acquisition [Line Items]
Intangible assets			$ 66,600					$ 66,600
Measurement Period Adjustments
Finite-lived intangible assets, useful life			5 years