Defined Contribution Plan, Minimum Annual Contributions Per Participating Employee, Percent

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- Definition

Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan.

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- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

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- Definition

Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919

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- Definition

Amount of net periodic benefit cost (credit) for defined benefit 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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- Definition

Amount of cost for defined contribution plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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- Definition

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

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No definition available.

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- Definition

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

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No definition available.

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- Definition

Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan.

+ References

No definition available.

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Employee Retirement Plans (Narrative) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan, minimum annual contributions per participating employee (as percent)	1.00%
Defined contribution plan, maximum annual contributions per employee (as percent)	70.00%
Defined contribution plan, cost recognized	$ 100,000
Defined benefit obligation	61,882,000	$ 61,714,000	$ 61,187,000
Net periodic benefit cost (income) (less than $1.0 million)	(372,000)	(6,000)
Funded (unfunded) status at end of year	$ (11,374,000)	$ (13,942,000)
Expected return on plan assets, net of administrative fees (as percent)	6.25%	6.25%
Qualified plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Funded (unfunded) status at end of year	$ 0	$ 6,000,000
Unfunded plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined benefit obligation	$ 5,900,000	$ 6,000,000
Fleet Employees Plan
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan, minimum annual contributions per participating employee (as percent)	2.00%
Defined contribution plan, maximum annual contributions per employee (as percent)	50.00%
Defined contribution plan, employer matching contribution, percent of match (as percent)	100.00%
Defined contribution plan, employer matching contribution, percent of employees pay (as percent)	6.00%
Defined contribution plan, cost recognized	$ 800,000
Contribution Tranche One
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan, employer matching contribution, percent of match (as percent)	100.00%
Defined contribution plan, employer matching contribution, percent of employees pay (as percent)	3.00%
Contribution Tranche Two
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined contribution plan, employer matching contribution, percent of match (as percent)	50.00%
Defined contribution plan, employer matching contribution, percent of employees pay (as percent)	3.00%