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v3.20.2

Variable Interest Entity (Details) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2020 USD ($) Rate
Variable Interest Entity [Line Items] |
Variable Interest Entity, Ownership Percentage | 96.30%
Deferred Compensation Share-based Arrangements, Liability, Classified, Noncurrent | $ | $ 0
VIE Percent Acquired [Domain] |
Variable Interest Entity [Line Items] |
Variable Interest Entity, Ownership Percentage | 42.60%

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- Definition Aggregate carrying value as of the balance sheet date of the liabilities for stock option plans and other equity-based compensation arrangements payable after one year (or the operating cycle, if longer). + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- 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
Name: | us-gaap_VariableInterestEntityLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of the Variable Interest Entity's (VIE) voting interest owned by (or beneficial interest in) the reporting entity (directly or indirectly). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=118582676&loc=SL6759159-111685 + Details
Name: | us-gaap_VariableInterestEntityOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=cmpr_VIEPercentAcquiredDomain
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |