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Fair Value Measurements - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Mar. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading investments for deferred compensation plan	$ 22,862,000		$ 22,862,000		$ 20,363,000
Equity method investments	7,200,000		7,200,000		6,600,000
Cost method investments	9,500,000		9,500,000		9,500,000
Impairment of non-marketable investments	0	$ 0	0	$ 0
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading investments for deferred compensation plan	$ 22,862,000		$ 22,862,000		$ 20,363,000

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+ References

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Amount of investment in equity security without readily determinable fair value.

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Amount of impairment loss on investment in equity security without readily determinable fair value.

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Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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