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Debt and Financing Arrangements - Summary of Unsecured Credit Facility (Detail) | Jun. 30, 2017 | Jun. 30, 2016
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Debt Instrument [Line Items] |  |
Weighted average rates | 2.60% | 2.38%
Minimum [Member] |  |
Debt Instrument [Line Items] |  |
Range of effective rates | 2.19% | 1.82%
Maximum [Member] |  |
Debt Instrument [Line Items] |  |
Range of effective rates | 4.75% | 3.50%

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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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