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Build-to-Suit Lease (Future Minimum Lease Payments) (Details) $ in Thousands	Sep. 30, 2018 USD ($)
Future minimum rental commitments
2019	$ 4,646
2020	4,772
2021	4,902
2022	5,035
2023	5,171
Thereafter	44,795
Financing Obligations - Total	69,321
Capital Leases, Future Minimum Payments, Present Value of Net Minimum Payments	42,034
Lisle Illinois Campus [Member]
Future minimum rental commitments
Capital Leases, Future Minimum Payments, Interest Included in Payments	(26,727)
Financing Obligation on Land Lease [Member] [Member] | Lisle Illinois Campus [Member]
Future minimum rental commitments
Imputed Accrued Land Lease Obligation	$ (560)

X

- Definition

Amount of minimum lease payments for capital leases.

+ References

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Amount of minimum lease payments for capital leases due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of minimum lease payments for capital leases due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of minimum lease payments for capital leases due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

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Amount of minimum lease payments for capital leases due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of minimum lease payments for capital leases due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount necessary to reduce net minimum lease payments to present value for capital leases.

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Present value of minimum lease payments for capital leases net of executory costs, including amounts paid by the lessee to the lessor for insurance, maintenance and taxes.

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Imputed Accrued Land Lease Obligation

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