ACQUISITIONS (Narrative) (Details) $ in Thousands | May 08, 2017USD ($) | May 25, 2017USD ($) | Nov. 07, 2016USD ($)ft² | Jun. 30, 2017USD ($) | Jun. 30, 2016USD ($) | Jun. 30, 2017USD ($) | Jun. 30, 2016USD ($) | Sep. 30, 2016USD ($) |
Business Acquisition [Line Items] | | | | | | | | |
Payments to Acquire Businesses, Net of Cash Acquired, Total | | | | | | $ 162,268 | $ 41,308 | |
Goodwill | | | | $ 365,965 | | 365,965 | | $ 323,616 |
Revenue, Net | | | | $ 171,189 | $ 140,191 | $ 478,735 | $ 411,954 | |
Customer Relationships [Member] | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | | | 20 years | | | | | |
Mayday Manufacturing Co [Member] | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | |
Payments to Acquire Businesses, Net of Cash Acquired, Total | | | $ 75,000 | | | | | |
Goodwill | | | 30,100 | | | | | |
Revenue, Net | | | 40,000 | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total | | | 16,600 | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities | | | $ 15,700 | | | | | |
Area of Land | ft² | | | 130,000 | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables | | | $ 7,400 | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory | | | 11,000 | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Capital Lease Obligation | | | 9,500 | | | | | |
Mayday Manufacturing Co [Member] | Trade Names [Member] | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total | | | 4,800 | | | | | |
Mayday Manufacturing Co [Member] | Customer Relationships [Member] | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill, Total | | | $ 32,800 | | | | | |
Morgan Schaffer Inc [Member] | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | |
Payments to Acquire Businesses, Gross | | $ 48,800 | | | | | | |
Goodwill | | 4,800 | | | | | | |
Revenue, Net | | 25,000 | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | | 3,400 | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total | | 1,700 | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables | | 2,500 | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory | | 5,200 | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets | | 400 | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable | | 3,800 | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets | | $ 34,600 | | | | | | |
Morgan Schaffer Inc [Member] | Customer Relationships and Developed Technology [Member] | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | | 10 years | | | | | | |
NRG Systems Inc [Member] | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | |
Payments to Acquire Businesses, Net of Cash Acquired, Total | $ 38,600 | | | | | | | |
Goodwill | 7,500 | | | | | | | |
Revenue, Net | 45,000 | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment, Total | 9,400 | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables | 4,100 | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory | 5,100 | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Capital Lease Obligation | 9,700 | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets | 1,000 | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable | 4,100 | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Indefinite-Lived Intangible Assets | 8,100 | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | 1,500 | | | | | | | |
NRG Systems Inc [Member] | Customer Relationships [Member] | | | | | | | | |
Business Acquisition [Line Items] | | | | | | | | |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles | $ 17,200 | | | | | | | |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 14 years | | | | | | | |