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Revenue Recognition (Revenue Reconciliation) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenues	$ 239,357	$ 258,026	$ 493,337	$ 514,599
Cost of sales	101,885	113,928	215,242	227,025
Total operating expenses	66,548	68,373	134,684	132,894
Income before income taxes	43,519	49,321	89,979	102,009
Provision for income taxes	12,678	18,616	24,672	37,545
Net income	30,841	$ 30,705	65,307	$ 64,464
Impact of Change | New Revenue Standard Adjustment
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenues	(16,165)		(22,110)
Cost of sales	(6,204)		(8,396)
Total operating expenses	(440)		(579)
Income before income taxes	(9,521)		(13,135)
Provision for income taxes	(2,771)		(3,752)
Net income	(6,750)		(9,383)
Without Adoption of ASC 606
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Total revenues	223,192		471,227
Cost of sales	95,681		206,846
Total operating expenses	66,108		134,105
Income before income taxes	33,998		76,844
Provision for income taxes	9,907		20,920
Net income	$ 24,091		$ 55,924

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