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Leases - Narrative (Details) $ in Millions | 3 Months Ended
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Sep. 30, 2017 USD ($)
Leases [Abstract] |
Airplane operating lease period | 7 years
Maximum residual value guarantee | $ 11.1
Fair value of residual value guarantee, fair value of operating lease asset, threshold | $ 14.4

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- Definition Airplane Operating Lease Period Years + References No definition available. + Details
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- Definition Fair Value Of Residual Value Guarantee Fair Value of Operating Lease Asset Threshold + References No definition available. + Details
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Namespace Prefix: | cr_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- References No definition available. + Details
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Period Type: | duration

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- Definition Amount of residual asset covered by residual value guarantee under operating lease. Excludes guarantee considered to be lease payments for lessor. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b)(3) -URI https://asc.fasb.org/extlink&oid=124258985&loc=SL77919359-209981 + Details
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