COMMITMENTS AND CONTINGENCIES: (Details) (USD $)	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Lease Obligations
Rents charged to expense under operating leases	$ 4,800,000	$ 5,200,000
Minimum future lease commitments
2014	4,550,694
2015	4,117,294
2016	3,482,798
2017	2,378,275
2018	2,145,973
Thereafter	3,683,480
Total minimum lease payments	20,358,514
Self-insured liabilities reserve
Beginning balance	1,400,000	1,600,000
Charged to expense	5,400,000	5,100,000
Payments	5,500,000	5,300,000
Ending balance	$ 1,300,000	$ 1,400,000