Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Nov. 30, 2014	Nov. 30, 2013	Nov. 30, 2012
OPERATING ACTIVITIES
Net income	$ 67,379us-gaap_NetIncomeLoss	$ 45,292us-gaap_NetIncomeLoss	$ 54,578us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on assumption of controlling interest in equity investee	(5,447)	0	0
Depreciation and amortization	90,352us-gaap_DepreciationAndAmortization	93,989us-gaap_DepreciationAndAmortization	77,870us-gaap_DepreciationAndAmortization
Stock-based compensation	2,826us-gaap_ShareBasedCompensation	2,533us-gaap_ShareBasedCompensation	1,874us-gaap_ShareBasedCompensation
Amortization of financing costs	1,779us-gaap_AmortizationOfFinancingCosts	1,397us-gaap_AmortizationOfFinancingCosts	1,605us-gaap_AmortizationOfFinancingCosts
Interest received on Staten Island note receivable	5,087isca_NonCashInterestRateSwapExpense	0isca_NonCashInterestRateSwapExpense	0isca_NonCashInterestRateSwapExpense
Deferred income taxes	(12,346)us-gaap_DeferredIncomeTaxExpenseBenefit	36,012us-gaap_DeferredIncomeTaxExpenseBenefit	12,184us-gaap_DeferredIncomeTaxExpenseBenefit
Income from equity investments	(8,916)	(9,434)	(2,757)
Distribution from equity investee	10,076	8,216	0
Losses on retirements of long-lived assets, non-cash	2,644	10,023	8,055
Other, net	380us-gaap_OtherNoncashIncomeExpense	(26)us-gaap_OtherNoncashIncomeExpense	(829)us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities
Receivables, net	(1,776)us-gaap_IncreaseDecreaseInReceivables	4,920us-gaap_IncreaseDecreaseInReceivables	5,268us-gaap_IncreaseDecreaseInReceivables
Inventories, prepaid expenses and other assets	1,977	(479)	966
Accounts payable and other liabilities	(517)	3,658	(2,521)
Deferred income	(1,692)	(8,990)	(3,023)
Income taxes	11,041	(13,716)	(2,345)
Net cash provided by operating activities	162,847	173,395	150,925
INVESTING ACTIVITIES
Capital expenditures	(183,936)	(85,539)	(82,872)
Distribution from equity investee and affiliate	11,924us-gaap_ProceedsFromRelatedPartyDebt	13,284us-gaap_ProceedsFromRelatedPartyDebt	11,000us-gaap_ProceedsFromRelatedPartyDebt
Equity investments and advances to affiliate	(1,322)us-gaap_PaymentsForAdvanceToAffiliate	0us-gaap_PaymentsForAdvanceToAffiliate	(51,984)us-gaap_PaymentsForAdvanceToAffiliate
Proceeds from sale of Staten Island property	6,100	5,322	0
Cash included in assumption of ownership interest in equity investee	4,686	0	0
Other, net	32	646	1,423
Net cash used in investing activities	(162,516)	(66,287)	(122,433)
FINANCING ACTIVITIES
Proceeds under credit facility	0us-gaap_ProceedsFromLinesOfCredit	0us-gaap_ProceedsFromLinesOfCredit	130,000us-gaap_ProceedsFromLinesOfCredit
Payments under credit facility	0us-gaap_RepaymentsOfLinesOfCredit	0us-gaap_RepaymentsOfLinesOfCredit	(180,000)us-gaap_RepaymentsOfLinesOfCredit
Proceeds from long-term debt	0	0	100,000
Payment of long-term debt	(2,807)us-gaap_RepaymentsOfLongTermDebt	(2,513)us-gaap_RepaymentsOfLongTermDebt	(89,306)us-gaap_RepaymentsOfLongTermDebt
Deferred financing fees	0us-gaap_PaymentsOfFinancingCosts	0us-gaap_PaymentsOfFinancingCosts	(1,046)us-gaap_PaymentsOfFinancingCosts
Exercise of Class A common stock options	0	341	0
Cash dividends paid	(11,181)us-gaap_PaymentsOfDividendsCommonStock	(10,229)us-gaap_PaymentsOfDividendsCommonStock	(9,283)us-gaap_PaymentsOfDividendsCommonStock
Reacquisition of previously issued common stock	(323)	(259)	(10,556)
Net cash used in financing activities	(14,311)	(12,660)	(60,191)
Net (decrease) increase in cash and cash equivalents	(13,980)	94,448	(31,699)
Cash and cash equivalents at beginning of year	172,827	78,379	110,078
Cash and cash equivalents at end of year	$ 158,847	$ 172,827	$ 78,379

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Amount of noncash expense included in interest expense to issue debt and obtain financing associated with the related debt instruments. Alternate captions include noncash interest expense.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.

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This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee.

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The increase (decrease) during the reporting period in the amounts payable to vendors for goods and services received and the amount of obligations and expenses incurred but not paid.

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The increase (decrease) during the period in the amount due for taxes based on the reporting entity's earnings or attributable to the entity's income earning process (business presence) within a given jurisdiction.

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The increase (decrease) during the reporting period, excluding the portion taken into income, in the liability reflecting revenue yet to be earned for which cash or other forms of consideration was received or recorded as a receivable.

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The increase (decrease) during the reporting period in the total amount of inventories and other operating assets not separately disclosed in the statement of cash flows.

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The increase (decrease) during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.

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The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy.

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- Definition

The cash inflow from a long-term borrowing made from related parties where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Proceeds from Advances from Affiliates.

+ References

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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- Definition

The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (j)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (a)

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- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

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-Publisher FASB

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-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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