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RETIREMENT PLANS: - (Details) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
	Jan. 01, 2019	Dec. 31, 2018	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Defined Contribution Plan Disclosure [Line Items]
Employer matching contribution, percent of match	100.00%	50.00%
Employer matching contribution, percent of employees' gross pay	6.00%	6.00%
Defined contribution plan cost			$ 9,400	$ 7,900	$ 2,900
Liabilities of non-qualified retirement plan			15,838	11,623
Supplemental Non-Qualified Deferred Compensation Plan
Defined Contribution Plan Disclosure [Line Items]
Assets of non-qualified retirement plan			$ 15,800
Liabilities of non-qualified retirement plan				$ 11,600

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- Definition

Assets Of Non-Qualified Retirement Plan

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X

- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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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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- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

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- Definition

Percentage employer matches of the employee's percentage contribution matched.

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