Fair Value Measurements and Derivatives Instruments (Tables)

6 Months Ended

Mar. 31, 2019

Derivative Instruments Gain Loss [Line Items]

Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

The following tables summarize the financial assets and liabilities measured at fair value on a recurring basis as of March 31, 2019 and September 30, 2018:

	March 31, 2019
	Carrying Value		Level 1		Level 2		Level 3
Other assets:
Investments held by Rabbi Trust	$	10,940	$	10,940	$	—	$	—
Total assets	$	10,940	$	10,940	$	—	$	—
Accrued expenses and other current liabilities:
Interest rate swap contracts	$	9,635	$	—	$	9,635	$	—
Other liabilities:
Interest rate swap contracts		8,437		—		8,437		—
Obligation to Rabbi Trust		10,940		10,940		—		—
Total liabilities	$	29,012	$	10,940	$	18,072	$	—

	September 30, 2018
	Carrying Value		Level 1		Level 2		Level 3
Other assets:
Investments held by Rabbi Trust	$	12,517	$	12,517	$	—	$	—
Total assets	$	12,517	$	12,517	$	—	$	—
Accrued expenses and other current liabilities:
Interest rate swap contracts	$	3,441	$	—	$	3,441	$	—
Other liabilities:
Interest rate swap contracts		12,098		—		12,098		—
Obligation to Rabbi Trust		12,517		12,517		—		—
Total liabilities	$	28,056	$	12,517	$	15,539	$	—

Interest Rate Swaps

Derivative Instruments Gain Loss [Line Items]

Summary of Effects on Consolidated Financial Statements of Designated As Cash Flow Hedges

The effects on the consolidated financial statements of the interest rate swaps which were designated as cash flow hedges were as follows:

	Three Months Ended March 31,						Six Months Ended March 31,
	2019			2018			2019			2018
(Loss) income recognized in Other comprehensive income	$	(1,917	)	$	4,210		$	(6,075	)	$	7,080
Net loss reclassified from Accumulated other       comprehensive loss into Interest expense		(2,597	)		(2,221	)		(3,433	)		(4,831	)