Dividends (Details)		3 Months Ended			9 Months Ended
		Mar. 31, 2016 $ / shares	Dec. 31, 2015 $ / shares	Mar. 31, 2015 $ / shares	Mar. 31, 2016 $ / shares	Mar. 31, 2015 $ / shares
Dividends [Abstract]
Stock split ratio				2	2	2
Dividends Payable [Line Items]
Cash dividends declared on common stock (in dollars per share)	[1]	$ 0.0925		$ 0.0900	$ 0.2775	$ 0.2700
2016 Q2 Dividend [Member]
Dividends Payable [Line Items]
Dividends payable, date declared					Jan. 19, 2016
Cash dividends declared on common stock (in dollars per share)			$ 0.0925
Dividends payable, date of record					Feb. 12, 2016
Dividends payable, date to be paid					Mar. 01, 2016
2016 Annual Dividend [Member]
Dividends Payable [Line Items]
Cash dividends declared on common stock (in dollars per share)					$ 0.37

[1] Share and per share data for 2015 have been adjusted for 2-for-1 stock split