COMMITMENTS, CONTINGENCIES, AND RELATED PARTY TRANSACTIONS: (Details) - USD ($)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Lease Obligations
Rents charged to expense under operating leases	$ 5,300,000	$ 5,000,000
Minimum future lease commitments
2016	4,790,387
2017	3,607,560
2018	3,184,076
2019	2,390,650
2020	1,687,248
Thereafter	1,399,456
Total minimum lease payments	17,059,377
Self-insured liabilities reserve
Beginning balance	1,400,000	1,300,000
Charged to expense	4,800,000	6,300,000
Payments	4,600,000	6,200,000
Ending balance	1,600,000	1,400,000
TIP Properties, LLC | Retail Segment
Lease Obligations
Annual rental payments related to warehouse space from TIP Properties, LLC	$ 100,000	$ 100,000