Asset Retirement Obligations (Tables)

12 Months Ended

Jun. 30, 2016

Asset Retirement Obligation Disclosure [Abstract]

Summary of asset retirement obligations and related assets

The following is a summary of our asset retirement obligations as shown on the accompanying Consolidated Balance Sheets:

($000)	2016		2015
Balance, beginning of year	3,796		3,261
Liabilities incurred	28		21
Liabilities settled	(266	)	(232	)
Accretion	271		246
Revisions in estimated cash flows	89		500
Balance, end of year	3,918		3,796