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INVESTMENTS (Details) - USD ($)				3 Months Ended		12 Months Ended
	Jul. 26, 2016	Jan. 28, 2016	May 01, 2015	Sep. 30, 2016	Sep. 30, 2015	Jun. 30, 2016
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments				$ 9,579,000	$ 4,590,000
Innovatix, LLC
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage						50.00%
Premier Supply Chain Improvement, Inc | FFF Enterprises, Inc.
Schedule of Equity Method Investments [Line Items]
Subsidiary of limited liability company or limited partnership, ownership interest, as a percent	49.00%
Cash portion of acquisition price	$ 65,700,000
Initial investment	75,900,000
Total acquisition price	7,400,000
Deferred taxes attributed to fair value of put and call rights	$ 2,800,000
Income (loss) from equity method investments				$ 3,000,000
Equity method investment, ownership percentage				49.00%
Premier Supply Chain Improvement, Inc | BloodSolutions, LLC
Schedule of Equity Method Investments [Line Items]
Net income from unconsolidated affiliates				$ 0
Premier Supply Chain Improvement, Inc | PharmaPoint, LLC
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments				(100,000)	(100,000)
Premier Supply Chain Improvement, Inc | Innovatix, LLC
Schedule of Equity Method Investments [Line Items]
Income (loss) from equity method investments				$ 6,500,000	$ 4,400,000
Equity method investment, ownership percentage				50.00%
Premier Supply Chain Improvement, Inc | Long-term investments | FFF Enterprises, Inc.
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investment				$ 78,900,000
Premier Supply Chain Improvement, Inc | Long-term investments | BloodSolutions, LLC
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investment				2,200,000		$ 2,200,000
Premier Supply Chain Improvement, Inc | Long-term investments | PharmaPoint, LLC
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investment				4,500,000		4,600,000
Premier Supply Chain Improvement, Inc | Long-term investments | Innovatix, LLC
Schedule of Equity Method Investments [Line Items]
Carrying value of equity method investment				$ 9,100,000		$ 9,000,000
Common Class B Unit | Premier Supply Chain Improvement, Inc | BloodSolutions, LLC
Schedule of Equity Method Investments [Line Items]
Subsidiary of limited liability company or limited partnership, ownership interest, as a percent		15.00%
Common limited partners, units acquired, units (in shares)		5,250,000
Common limited partners, units acquired, value		$ 2,300,000
Common Class B Unit | Premier Supply Chain Improvement, Inc | PharmaPoint, LLC
Schedule of Equity Method Investments [Line Items]
Subsidiary of limited liability company or limited partnership, ownership interest, as a percent				28.00%		28.00%
Common limited partners, units acquired, units (in shares)				5,000,000		5,000,000
Common Class B Unit | Premier Supply Chain Improvement, Inc | Nations Pharmaceuticals, LLC
Schedule of Equity Method Investments [Line Items]
Subsidiary of limited liability company or limited partnership, ownership interest, as a percent			72.00%
Common Class A Unit | Premier Supply Chain Improvement, Inc | Nations Pharmaceuticals, LLC
Schedule of Equity Method Investments [Line Items]
Common limited partners, units acquired, units (in shares)			13,000,000

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