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Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended					12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2021	May 01, 2020
Accounting Policies [Line Items]
Prior Period Reclassification Adjustment			$ 5,489	$ 5,241		$ 16,552
Marketable Securities, Current	$ 152,028	$ 152,248				152,248
Marketable securities, non-current	40,400	50,713				50,713
Total Marketable Securities	192,428	202,961				202,961
Unrealized Gain (Loss) on Investments	(119)	(175)
Investments, Fair Value Disclosure	192,309	202,786				202,786
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	13,327				$ (13,495)
Foreign Currency Transaction Gain (Loss), Realized	9,350				4,075
Other Nonoperating Gains (Losses)	(480)				666
Total other income (expense), net	22,197				(8,754)
Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments	$ 3,288				$ 5,437
Weighted average shares outstanding — basic	26,072,249				25,945,998
Weighted average shares issuable upon exercise/vesting of outstanding share options/RSUs/warrants (1)	511,564				0
Weighted average shares outstanding — diluted	26,583,813				25,945,998
Weighted average anti-dilutive shares excluded from diluted net income (loss) per share attributable to Cimpress plc (2)	18,447				450,089
Class of Warrant or Right, Exercise Price of Warrants or Rights							$ 60
Commercial Paper
Accounting Policies [Line Items]
Marketable Securities, Current	$ 64,478	74,463				74,463
Unrealized Gain (Loss) on Investments	(13)	(28)
Investments, Fair Value Disclosure	64,465	74,435				74,435
Corporate Debt Securities
Accounting Policies [Line Items]
Marketable Securities, Current	$ 87,550	77,785				77,785
Warrant [Member]
Accounting Policies [Line Items]
Weighted average shares issuable upon exercise/vesting of outstanding share options/RSUs/warrants (1)	409,561				316,257
Foreign Exchange Forward [Member]
Accounting Policies [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ 12,863				$ (13,468)
Interest Rate Swap [Member]
Accounting Policies [Line Items]
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	464				$ (27)
Marketable securities, current [Member]
Accounting Policies [Line Items]
Unrealized Gain (Loss) on Investments	(58)	(85)
Investments, Fair Value Disclosure	151,970	152,163				152,163
Marketable securities, current [Member] \| Corporate Debt Securities
Accounting Policies [Line Items]
Unrealized Gain (Loss) on Investments	(45)	(57)
Investments, Fair Value Disclosure	87,505	77,728				77,728
Marketable securities, noncurrent [Member]
Accounting Policies [Line Items]
Unrealized Gain (Loss) on Investments	(61)	(90)
Investments, Fair Value Disclosure	$ 40,339	$ 50,623				$ 50,623