Fair Value Measurements and Derivatives Instruments (Tables)

9 Months Ended

Jun. 30, 2018

Derivative Instruments Gain Loss [Line Items]

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

The following table summarizes the financial assets and liabilities measured at fair value on a recurring basis as of June 30, 2018 and September 30, 2017:

	June 30, 2018
	Carrying Value		Level 1		Level 2		Level 3
Other assets:
Investments held by Rabbi Trust	$	12,015	$	12,015	$	—	$	—
Total assets	$	12,015	$	12,015	$	—	$	—
Accrued expenses and other current liabilities:
Interest rate swap contracts	$	5,706	$	—	$	5,706	$	—
Other liabilities:
Interest rate swap contracts		12,868		—		12,868		—
Obligation to Rabbi Trust		12,015		12,015		—		—
Total liabilities	$	30,589	$	12,015	$	18,574	$	—

	September 30, 2017
	Carrying Value		Level 1		Level 2		Level 3
Other assets:
Investments held by Rabbi Trust	$	11,004	$	11,004	$	—	$	—
Total assets	$	11,004	$	11,004	$	—	$	—
Accrued expenses and other current liabilities:
Interest rate swap contracts	$	4,621	$	—	$	4,621	$	—
Fuel hedge contracts		50		—		50		—
Other liabilities:
Interest rate swap contracts		30,518		—		30,518		—
Obligation to Rabbi Trust		11,004		11,004		—		—
Total liabilities	$	46,193	$	11,004	$	35,189	$	—

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 June 30,						Nine Months Ended June 30,
	2018			2017			2018			2017
Income (loss) recognized in Other comprehensive income         (effective portion)	$	2,047		$	(2,794	)	$	9,127		$	5,529
Loss recognized in Interest expense (ineffective portion)		(2	)		(4	)		(1	)		(3	)
Net loss reclassified from Accumulated other         comprehensive loss into Interest expense		(2,513	)		(2,966	)		(7,344	)		(6,770	)

Fuel Swap Contracts

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 fuel swaps which were designated as cash flow hedges were as follows:

	Three Months Ended June 30,					Nine Months Ended June 30,
	2018		2017			2018		2017
(Loss) income recognized in Other comprehensive income         (effective portion)	$	—	$	(201	)	$	57	$	(1,100	)
Income (loss) recognized in Cost of services provided (ineffective         portion)		—		23			—		(22	)
Net (loss) income reclassified from Accumulated other         comprehensive loss into Cost of services provided		—		(90	)		7		(2,146	)