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Commitments and Contingencies (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded unconditional purchase obligation	$ 250,458
Amounts accrued related to business acquisitions	44,852	$ 1,676
99designs acquisition [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Amounts accrued related to business acquisitions	44,423
Third-party web services [Domain]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded unconditional purchase obligation	100,652
Inventories [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded unconditional purchase obligation	55,731
Software and Software Development Costs
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded unconditional purchase obligation	52,957
Advertising Purchase Commitment [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded unconditional purchase obligation	10,078
Production and Computer Equipment [Domain]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded unconditional purchase obligation	10,047
Professional Fees [Domain]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded unconditional purchase obligation	7,958
Other purchase commitments [Member]
Unrecorded Unconditional Purchase Obligation [Line Items]
Unrecorded unconditional purchase obligation	$ 13,035

X

- Definition

Future amounts due for acquisition of businesses

+ References

No definition available.

+ Details

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Namespace Prefix:	cmpr_
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Balance Type:	debit
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X

- Definition

Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123406679&loc=d3e25336-109308

+ Details

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X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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- Details

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