Acquisitions (Narratives) (Details) - USD ($)	3 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Mar. 31, 2019
Business Acquisition [Line Items]
Gain (Loss) on Disposition of Business	$ (169,000)	$ (11,100,000)
Revenue from Contract with Customer, Excluding Assessed Tax	212,712,000	224,992,000
Business Acquisition, Period Results Included in Combined Entity	27,043,000	13,503,000
Proceeds from Secured Lines of Credit	445,000,000
Goodwill	325,301,000		$ 322,816,000
Accrued liabilities	$ 99,752,000		$ 99,304,000
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Business Acquisition [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax		11,104,000
Business Acquisition, Period Results Included in Combined Entity		$ 660,000

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of gain (loss) from sale and disposal of integrated set of activities and assets capable of being conducted and managed for purpose of providing return in form of dividend, lower cost, or other economic benefit to investor, owner, member and participant.

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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