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Accumulated Other Comprehensive Loss (Components of AOCI) (Details) - USD ($)	6 Months Ended	12 Months Ended
	Sep. 30, 2018	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of accumulated other comprehensive loss	$ 1,193,238,000	$ 1,178,610,000
Reclassification from accumulated other comprehensive loss into earnings	0	0
Cumulative translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of accumulated other comprehensive loss	(25,517,000)	(20,398,000)
Unrecognized net gain on pension plans
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of accumulated other comprehensive loss	1,083,000	1,083,000
Accumulated other comprehensive loss, net of tax
Accumulated Other Comprehensive Income (Loss) [Line Items]
Components of accumulated other comprehensive loss	$ (24,434,000)	$ (19,315,000)

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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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Amount after tax of reclassification adjustments of other comprehensive income (loss) attributable to parent.

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Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.

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