Schedule I - CONDENSED FINANCIAL INFORMATION OF PARENT COMPANY (Detail) - CONDENSED BALANCE SHEETS PARENT COMPANY ONLY (USD $)	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2010
CURRENT ASSETS:
Cash and cash equivalents	$ 69,073,000	$ 75,013,000	$ 91,019,000	$ 100,398,000
Accounts receivable - net	11,567,000	12,784,000
Refundable income taxes	1,347,000	1,816,000
Prepaid expenses and other	4,091,000	3,987,000
Total current assets	114,927,000	127,039,000
Property and equipment - net	223,180,000	240,084,000
Other assets	6,761,000	7,884,000
Equity method investments	59,959,000	61,679,000
Restricted investments and deposits	503,000	1,363,000
TOTAL ASSETS	405,330,000	438,049,000	375,722,000
CURRENT LIABILITIES:
Current portion of long term debt	15,623,000	15,222,000
Accounts payable – trade	4,655,000	6,985,000
Deferred income	627,000	1,864,000
Accrued real estate taxes	2,651,000	2,750,000
Accrued payroll and related items	302,000	2,882,000
Other current liabilities	5,742,000	5,844,000
Total current liabilities	31,459,000	37,241,000
LONG TERM LIABILITIES:
Long term debt	91,306,000	108,527,000	70,973,000
Deferred taxes	7,141,000	4,642,000
Deferred income		552,000
Other long term liabilities	211,000	2,703,000
Total long term liabilities	99,588,000	118,965,000
EQUITY:
Common stock, 45,000 shares authorized, 29,853 shares issued at par	299,000	299,000
Paid in capital	143,575,000	142,994,000
Retained earnings	322,028,000	324,323,000
Treasury stock, 21,701 and 21,523 shares, respectively	219,550,000	215,105,000
Total shareholders’ equity	246,352,000	252,511,000
TOTAL LIABILITIES AND EQUITY	405,330,000	438,049,000
Parent Company [Member]
CURRENT ASSETS:
Cash and cash equivalents	47,744,000	46,066,000	72,656,000	82,478,000
Accounts receivable - net	280,000	203,000
Refundable income taxes	1,347,000	1,816,000
Prepaid expenses and other	259,000	253,000
Deferred taxes - net	3,930,000	3,090,000
Total current assets	53,560,000	51,428,000
Property and equipment - net	12,365,000	16,404,000
Other assets	1,045,000	1,825,000
Equity method investments	189,012,000	196,871,000
Restricted investments and deposits	503,000	1,363,000
TOTAL ASSETS	256,485,000	267,891,000
CURRENT LIABILITIES:
Current portion of long term debt	187,000	250,000
Accounts payable – trade	40,000	148,000
Deferred income	552,000	1,864,000
Accrued real estate taxes	387,000	410,000
Accrued payroll and related items	60,000	2,606,000
Other current liabilities	1,308,000	1,565,000
Total current liabilities	2,534,000	6,843,000
LONG TERM LIABILITIES:
Long term debt	433,000	821,000
Deferred taxes	6,955,000	4,461,000
Deferred income		552,000
Other long term liabilities	211,000	2,703,000
Total long term liabilities	7,599,000	8,537,000
EQUITY:
Common stock, 45,000 shares authorized, 29,853 shares issued at par	299,000	299,000
Paid in capital	143,575,000	142,994,000
Retained earnings	322,028,000	324,323,000
Treasury stock, 21,701 and 21,523 shares, respectively	(219,550,000)	(215,105,000)
Total shareholders’ equity	246,352,000	252,511,000
TOTAL LIABILITIES AND EQUITY	$ 256,485,000	$ 267,891,000