Leases - Supplemental Balance Sheet (Details) $ in Millions	Mar. 31, 2019 USD ($)
Assets
Operating lease assets	$ 62
Finance lease assets	1
Total lease assets	63
Current
Operating	21
Finance	0
Noncurrent
Operating	43
Finance	0
Total lease liabilities	$ 64

Finance Lease, Liability, Current Maturities

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Balance Type:	credit
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- Definition

Operating Lease, Liability, Current, Accrued Expenses and Other

+ References

No definition available.

+ Details

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Namespace Prefix:	cvet_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Operating Lease, Liability, Noncurrent, Other Liabilities

+ References

No definition available.

+ Details

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Namespace Prefix:	cvet_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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- Definition

Operating and Finance Leases, Liability

+ References

No definition available.

+ Details

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- Definition

Operating and Finance Leases, Right-of-Use Asset

+ References

No definition available.

+ Details

Name:	cvet_OperatingandFinanceLeasesRightofUseAsset
Namespace Prefix:	cvet_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

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Data Type:	xbrli:stringItemType
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- Definition

Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of lessee's right to use underlying asset under finance lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant

- References

No definition available.

+ Details

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
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- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	debit
Period Type:	instant