Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- 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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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued 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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- Definition

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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No definition available.

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Stock Compensation - Annual Awards (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 01, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2018	Dec. 31, 2017
Annual RSUs and Annual PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation expenses		$ 2,343	$ 2,461	$ 7,126	$ 7,163
Unrecognized Stock Compensation Expense		$ 11,434		$ 11,434
Stock Incentive Plan 2015 \| Annual RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				3 years
Granted (in shares)		765		60,000
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 127.27		$ 115.80
Stock Incentive Plan 2015 \| Annual PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period (in years)				3 years
Granted (in shares)		0		31,320
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 0.00		$ 116.34
Stock Incentive Plan 2015 \| Annual RSUs and Annual PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		765		91,320
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value		$ 127.27		$ 115.98
Subsequent Event \| Stock Incentive Plan 2015 \| Annual RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	400
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 125.10
Subsequent Event \| Stock Incentive Plan 2015 \| Annual PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)	0