Operating Leases - Narrative (Details) ft² in Millions, $ in Millions	12 Months Ended
	Jun. 30, 2017 USD ($) Lease	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($) ft²
Operating Leased Assets [Line Items]
Number of options available for store lease extensions | Lease	2
Period available under each store lease renewal option (in years)	5 years
Leases area for distribution center | ft²			0.6
Rent expense | $	$ 108.0	$ 98.3	$ 86.6
Minimum
Operating Leased Assets [Line Items]
Initial term of the store lease (in years)	5 years
Period after which leases for new stores can be terminated if the store does not deliver sales expectations	24 months
Maximum
Operating Leased Assets [Line Items]
Initial term of the store lease (in years)	10 years
Period after which leases for new stores can be terminated if the store does not deliver sales expectations	60 months