COMMITMENTS AND CONTINGENCIES: (Details) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Lease Obligations
Rents charged to expense under operating leases	$ 5,000,000	$ 4,800,000
Minimum future lease commitments
2015	5,181,128
2016	4,626,874
2017	3,502,929
2018	3,087,873
2019	2,403,146
Thereafter	2,945,822
Total minimum lease payments	21,747,772
Self-insured liabilities reserve
Beginning balance	1,300,000	1,400,000
Charged to expense	6,300,000	5,400,000
Payments	6,200,000	5,500,000
Ending balance	$ 1,400,000	$ 1,300,000