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Shareholders' Equity and Share-based Compensation - Share-based Compensation (Details) - USD ($)	3 Months Ended			9 Months Ended	89 Months Ended
	Mar. 31, 2018	Jun. 30, 2017	Mar. 31, 2017	Mar. 31, 2018	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Repurchase of common shares under shares repurchase program				748,936	6,472,029
Options, Weighted-Average Remaining Contractual Life (in years)		4 years 5 months 5 days		4 years 2 months 9 days
Options vested and expected to vest, Number Outstanding (in shares)	919,821			919,821	919,821
Options vested and expected to vest, Weighted Average Exercise Price (in dollars per share)	$ 10.99			$ 10.99	$ 10.99
Options vested and expected to vest, Weighted Average Remaining Contractual Life (in years)				4 years 2 months 9 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value	$ 4,521,497			$ 4,521,497	$ 4,521,497
Options, Number Exercisable (in shares)	916,936			916,936	916,936
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Exercise Price	$ 11.00			$ 11.00	$ 11.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term	4 years 2 months 9 days
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 4,502,312			$ 4,502,312	$ 4,502,312
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at June 30, 2017				1,053,367
Granted (in shares)				0
Exercised (in shares)				(133,514)
Outstanding at March 31, 2018	919,853	1,053,367		919,853	919,853
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding at June 30, 2017 (in dollars per share)				$ 10.98
Exercised (in dollars per share)				10.90
Outstanding at December 31, 2017 (in dollars per share)	$ 10.99	$ 10.98		$ 10.99	$ 10.99
Options Outstanding Aggregate Intrinsic Value	$ 4,521,710	$ 6,212,660		$ 4,521,710	$ 4,521,710
Options Exercised Aggregate Intrinsic Value				$ 818,624
Performance Based Restricted Stock Units (PRSUs) Member [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted	298,000		170,000
Employee Share Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility Rate				45.32%
Expected Term				1 year 3 months 18 days
Expected Dividend Rate				0.00%
Employee Share Purchase Plan [Member] | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk Free Interest Rate				1.40%
Employee Share Purchase Plan [Member] | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk Free Interest Rate				1.70%

X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Weighted average expected volatility rate of share-based compensation awards.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Gross number of share options (or share units) granted during the period.

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted-average exercise price, at which grantee can acquire shares reserved for issuance, for fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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