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Summary of Significant Accounting Policies - Concentration Risk (Details) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2017 USD ($) contract	Dec. 31, 2016 contract	Dec. 31, 2017 USD ($) contract	Dec. 31, 2016 contract	Jun. 30, 2017 USD ($)
Inventories
Excess and obsolete inventory reserve | $	$ 3.2		$ 3.2		$ 2.3
Revenue | Customer Concentration Risk
Concentration of revenues
Concentration risk (as a percent)	10.00%	9.00%	10.00%	10.00%
Number of customers with concentration	1	1	1	1
Accounts Receivable | Customer Concentration Risk
Concentration of revenues
Concentration risk (as a percent)			7.00%
Number of contracts with concentration of risk	1		1

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- Definition

Represents the number of contracts in which the entity has a concentration of risk.

+ References

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Represents the number of customers in which the entity has a concentration of risk.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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Amount of valuation reserve for inventory.

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