Derivative Financial Instruments (Schedule Of Cash Flow Hedging Instruments) (Detail) - Cash Flow Hedging - Designated as Hedging Instrument	Mar. 31, 2019 USD ($)
June 2019
Derivative [Line Items]
Notional Amount	$ 200,000,000
Fair Value Asset (Liability)	429,000
July 2019
Derivative [Line Items]
Notional Amount	250,000,000
Fair Value Asset (Liability)	1,083,000
August 2019
Derivative [Line Items]
Notional Amount	275,000,000
Fair Value Asset (Liability)	1,841,000
September 2023
Derivative [Line Items]
Notional Amount	139,286,000
Fair Value Asset (Liability)	(2,589,000)
Total Cash Flow Hedges
Derivative [Line Items]
Notional Amount	864,286,000
Fair Value Asset (Liability)	$ 764,000