Condensed Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares	3 Months Ended		9 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Statement of Stockholders' Equity [Abstract]
Cash dividends declared per common share (in USD per share)	$ 0.16	$ 0.140	$ 0.48
Common stock issued per share for stock bonus (in USD per share)	$ 32.45	$ 34.32	$ 34.32