Supplemental disclosure of cash flow information (Narrative) (Details)	9 Months Ended
	Mar. 31, 2016 USD ($)
Supplemental Disclosure Of Cash Flow Information 1	$ 600,000.0
Supplemental Disclosure Of Cash Flow Information 2	1,100,000.0
Supplemental Disclosure Of Cash Flow Information 3	100,000.0
Supplemental Disclosure Of Cash Flow Information 4	500,000.0
Supplemental Disclosure Of Cash Flow Information 5	700,000.0
Supplemental Disclosure Of Cash Flow Information 6	200,000.0
Supplemental Disclosure Of Cash Flow Information 7	200,000.0
Supplemental Disclosure Of Cash Flow Information 8	800,000.0
Supplemental Disclosure Of Cash Flow Information 9	100,000.0
Supplemental Disclosure Of Cash Flow Information 10	$ 900,000.0