Employee Benefit Plans - Target Plan Asset Allocation (Details)	Jun. 30, 2017
Defined Benefit Plan Disclosure
Target Plan Asset Allocations	100.00%
U.S. large cap equity securities
Defined Benefit Plan Disclosure
Target Plan Asset Allocations	40.00%
U.S. small cap equity securities
Defined Benefit Plan Disclosure
Target Plan Asset Allocations	4.80%
International equity securities
Defined Benefit Plan Disclosure
Target Plan Asset Allocations	19.20%
Debt securities
Defined Benefit Plan Disclosure
Target Plan Asset Allocations	30.00%
Real estate
Defined Benefit Plan Disclosure
Target Plan Asset Allocations	6.00%

Percentage of target investment allocation to total plan assets. Includes, but is not limited to, percentage on weighted-average basis if more than one plan.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (d)(5)(i)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

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