Capital and Financing Transactions - Notes Payable (Details) (USD $)	0 Months Ended	9 Months Ended
	Apr. 01, 2014	Sep. 30, 2014		Apr. 01, 2014
Debt Instrument [Line Items]
Interest Rate		3.13%	[1]
Outstanding Balance		$ 350,000,000
$10.0 Million Working Capital Credit Facility
Debt Instrument [Line Items]
Interest Rate		1.70%
Maturity		Mar. 30, 2018
Outstanding Balance		0
$250.0 Million Revolving Credit Facility
Debt Instrument [Line Items]
Interest Rate		1.70%
Maturity		Mar. 30, 2018
Outstanding Balance		0
Debt instrument face amount	215,000,000			215,000,000
$125.0 Million Five-Year Term Loan
Debt Instrument [Line Items]
Debt instrument face amount	125,000,000			125,000,000
$120.0 Million Seven-Year Term Loan
Debt Instrument [Line Items]
Debt instrument face amount	120,000,000			120,000,000
Line of Credit | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity				250,000,000.0
Term of debt extension option	1 year
Interest rate at period end (in percent)		1.70%
Line of Credit | LIBOR | Revolving Credit Facility
Debt Instrument [Line Items]
Variable reference rate on debt	LIBOR
Interest rate during period on debt (in percent)	1.55%
Line of Credit | Minimum | LIBOR | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)	1.40%
Line of Credit | Maximum | LIBOR | Revolving Credit Facility
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)	2.00%
Seven-year Term Loan | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate		4.46%
Maturity		Mar. 31, 2021
Outstanding Balance		100,000,000
Maximum borrowing capacity				100,000,000.0
Term of debt instrument	7 years
Interest rate at period end (in percent)				4.46%
Seven-year Term Loan | Unsecured Debt | LIBOR
Debt Instrument [Line Items]
Variable reference rate on debt	LIBOR
Interest rate during period on debt (in percent)	1.90%
Seven-year Term Loan | Unsecured Debt | Minimum | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)	1.75%
Seven-year Term Loan | Unsecured Debt | Maximum | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)	2.30%
Five-year Term Loan | Unsecured Debt
Debt Instrument [Line Items]
Interest Rate		2.61%
Maturity		Mar. 29, 2019
Outstanding Balance		250,000,000
Maximum borrowing capacity				250,000,000.0
Term of debt instrument	5 years
Interest rate at period end (in percent)				2.61%
Five-year Term Loan | Unsecured Debt | LIBOR
Debt Instrument [Line Items]
Variable reference rate on debt	LIBOR
Interest rate during period on debt (in percent)	1.45%
Five-year Term Loan | Unsecured Debt | Minimum | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)	1.35%
Five-year Term Loan | Unsecured Debt | Maximum | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate (in percent)	1.90%
Amended Working Capital Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity	$ 10,000,000.0			$ 10,000,000.0

[1] Represents a weighted average interest rate based on total outstanding balances.