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Derivative Instruments and Hedging Activities - Fair Value in the Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands | 6 Months Ended |
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Dec. 31, 2018 | Jun. 30, 2018
Foreign currency forward contracts |  |
Derivatives, Fair Value [Line Items] |  |
Notional amount of forward contracts held to sell U.S. dollars in exchange for Canadian dollars | $ 53,400 | $ 47,100
Accounts Payable and Accrued Liabilities | Cash Flow Hedging | Designated As Hedging Instrument | Foreign currency forward contracts |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value Asset (Liability) | $ (2,056) |
Prepaid expenses and other current assets | Cash Flow Hedging | Designated As Hedging Instrument | Foreign currency forward contracts |  |
Derivatives, Fair Value [Line Items] |  |
Fair Value Asset (Liability) |  | $ (1,319)
Minimum |  |
Derivatives, Fair Value [Line Items] |  |
Contract maturity | 1 month |
Maximum |  |
Derivatives, Fair Value [Line Items] |  |
Contract maturity | 12 months |

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Period the derivative contract is outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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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
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