Principal Components of Net Deferred Tax Liability (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Deferred tax assets:
Deferred revenue	$ 1,255,000	$ 1,265,000
Restricted stock	390,000	579,000
Workers' compensation	224,000	270,000
State tax net operating loss (NOL) carry forward	802,000	691,000
Federal tax NOL carry forward	9,012,000	12,776,000
Foreign tax NOL carry forward	952,000
Self-insurance	286,000	298,000
Canadian start-up costs	405,000	153,000
AMT credit carry forward	310,000	177,000
Other	166,000	210,000
Total gross deferred tax assets	13,802,000	16,419,000
Less valuation allowance	(1,265,000)	0
Total net deferred tax assets	12,537,000	16,419,000
Deferred tax liabilities:
Property and equipment	(46,563,000)	(42,172,000)
Total deferred tax liabilities	(46,563,000)	(42,172,000)
Current portion of net deferred tax asset/liability	1,664,000	1,925,000
Non-current portion of net deferred tax asset/liability	(35,690,000)	(27,678,000)
Total net deferred tax liability	$ (34,026,000)	$ (25,753,000)