Business Combinations (Narrative) (Details) business in Thousands				1 Months Ended	3 Months Ended	12 Months Ended			13 Months Ended	14 Months Ended
	Nov. 01, 2021 USD ($)	Oct. 05, 2020 USD ($)	Apr. 30, 2019 USD ($) business	Oct. 31, 2020 USD ($)	Nov. 30, 2021 USD ($)	Nov. 30, 2021 USD ($)	Nov. 30, 2020 USD ($)	Nov. 30, 2019 USD ($)	May 30, 2020 USD ($)	Nov. 30, 2021 USD ($)	May 31, 2020 USD ($)
Business Acquisition [Line Items]
Goodwill					$ 671,152,000	$ 671,152,000	$ 491,726,000	$ 432,824,000		$ 671,152,000
Acquisition-related expenses						$ 4,102,000	3,637,000	1,658,000
Federal statutory income tax rate, percent						24.50%
Goodwill, purchase accounting adjustments						$ 77,000	838,000
Share-based payment arrangement, expense						$ 29,724,000	$ 23,482,000	$ 23,311,000
Restricted Stock Units (RSUs)
Business Acquisition [Line Items]
Vesting period						3 years
Revolving Line of Credit
Business Acquisition [Line Items]
Proceeds from lines of credit				$ 98,500,000
Credit Agreement | Revolving Line of Credit
Business Acquisition [Line Items]
Proceeds from lines of credit		$ 98,500,000
Kemp Acquisition
Business Acquisition [Line Items]
Payments to acquire businesses	$ 258,000,000
Escrow deposit	2,000,000
Intangible assets					122,100,000	$ 122,100,000				122,100,000
Goodwill	179,521,000
Acquisition-related expenses					1,900,000
Revenue of acquisition						5,900,000
Kemp Acquisition | Purchased technology
Business Acquisition [Line Items]
Intangible assets	39,400,000
Kemp Acquisition | Trade name
Business Acquisition [Line Items]
Intangible assets	7,200,000
Kemp Acquisition | Customer-related
Business Acquisition [Line Items]
Intangible assets	$ 75,500,000
Chef Acquisition
Business Acquisition [Line Items]
Payments to acquire businesses		220,000,000
Escrow deposit		12,000,000
Intangible assets					141,300,000	141,300,000				141,300,000
Goodwill		59,858,000			59,585,000	59,585,000				59,585,000
Acquisition-related expenses						700,000
Goodwill, purchase accounting adjustments										273,000
Chef Acquisition | Purchased technology
Business Acquisition [Line Items]
Intangible assets		38,300,000			38,300,000	38,300,000				38,300,000
Chef Acquisition | Trade name
Business Acquisition [Line Items]
Intangible assets		5,700,000			5,700,000	5,700,000				5,700,000
Chef Acquisition | Customer-related
Business Acquisition [Line Items]
Intangible assets		$ 97,300,000			$ 97,300,000	97,300,000				$ 97,300,000
Ipswitch
Business Acquisition [Line Items]
Escrow deposit			$ 22,500,000
Goodwill			117,651,000								$ 117,033,000
Total purchase consideration			$ 225,000,000
Number of businesses acquired | business			24
Goodwill, purchase accounting adjustments									$ 618,000
Ipswitch | Restricted Stock Units (RSUs)
Business Acquisition [Line Items]
Consideration payable in the form of restricted stock units			$ 2,000,000
Vesting period			3 years
Remaining amortization period			3 years
Share-based payment arrangement, expense						$ 700,000
Ipswitch | Purchased technology
Business Acquisition [Line Items]
Intangible assets			$ 33,100,000								33,100,000
Ipswitch | Trade name
Business Acquisition [Line Items]
Intangible assets			9,600,000								9,600,000
Ipswitch | Customer-related
Business Acquisition [Line Items]
Intangible assets			66,600,000								$ 66,600,000
Ipswitch | Term Loan
Business Acquisition [Line Items]
Aggregate principal amount			185,000,000
Term loan and maximum borrowing capacity			$ 401,000,000