BUSINESS COMBINATION (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended					6 Months Ended	9 Months Ended
	Oct. 22, 2015	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Dec. 31, 2015	Jun. 30, 2016	Jun. 30, 2015
Business Acquisition [Line Items]
Acquisition of business, net of cash acquired								$ 126,976	$ 0
Share-based compensation expense								11,029	12,416
Revenue		$ 108,152				$ 97,168		307,765	313,960
Net loss		18,702				9,886		39,142	43,613
Fair values of assets acquired and liabilities assumed [Abstract]
Intangible assets	$ 61,000
Goodwill		95,711			$ 40,442			95,711
NexPlanar [Member]
Business Acquisition [Line Items]
Percentage of voting interests acquired	100.00%
Acquisition of business, net of cash acquired	$ 126,906
Cash Acquired from Acquisition	15,261
Purchase price	142,167
Share-based compensation expense		(451)		$ 605				154
Decrease in goodwill		(362)
Purchase price adjustment			$ 70
Revenue		6,363						15,743
Net loss		(1,616)						(5,918)
Fair values of assets acquired and liabilities assumed [Abstract]
Total purchase consideration	142,237
Cash	15,261
Accounts receivable	3,072
Inventories	2,768
Prepaid expenses and other current assets	1,712
Property, plant and equipment	6,901
Intangible assets	61,000
Deferred tax assets	20,569
Other long-term assets	1,458
Accounts payable	(1,057)
Accrued expenses and other current liabilities	(1,472)
Deferred tax liabilities	(22,457)
Total identifiable net assets	87,755
Goodwill	$ 54,482
Transaction and acquisition-related expenses							$ 816
Weighted average useful life	7 years 9 months 18 days
Business acquisition, pro forma information [Abstract]
Revenues		108,152				102,796		309,172	331,123
Net income		$ 18,412				$ 7,563		$ 39,915	$ 36,870
Earnings per share - basic (in dollars per share)		$ 0.76				$ 0.31		$ 1.65	$ 1.52
Earnings per share - diluted (in dollars per share)		$ 0.75				$ 0.30		$ 1.62	$ 1.48
Inventory adjustments	$ 403
Acquired Finite-Lived Intangible Assets [Line Items]
Preliminary fair value	61,000
NexPlanar [Member] | General and Administrative Expense [Member]
Fair values of assets acquired and liabilities assumed [Abstract]
Transaction and acquisition-related expenses				$ 290	$ 526
NexPlanar [Member] | Trade Name [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Preliminary fair value	$ 8,000
Useful life	7 years
NexPlanar [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Preliminary fair value	$ 8,000
Useful life	11 years
NexPlanar [Member] | Developed Technology - Product Family A [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Preliminary fair value	$ 25,000
Useful life	7 years
NexPlanar [Member] | Developed Technology - Product Family B [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Preliminary fair value	$ 8,000
Useful life	8 years
NexPlanar [Member] | In-process Technology [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Preliminary fair value	$ 12,000