SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - NARRATIVE (Details)	3 Months Ended				6 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($)	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Sep. 30, 2015	Mar. 31, 2016 USD ($) system $ / shares shares	Mar. 31, 2015 USD ($) $ / shares shares	Apr. 29, 2015 shares
Deferred Revenue Arrangement [Line Items]
Net cash provided by (used in) investing activities						$ 1,389,000	$ (514,000)
Net cash provided by (used in) financing activities						(17,633,000)	(40,941,000)
Goodwill, Impairment Loss	$ 0					(18,000,000)	(6,000,000)
Fair Value Inputs, Federal and State Tax Rate					40.00%
Participations and royalties payable	27,463,000			$ 37,766,000		$ 27,463,000	37,766,000
Number of systems that have ceased to earn VPF | system						101
Percent of systems expected to cease earning VPF (more than)						50.00%
Deferred revenue for period exhibitor contributions						10 years
Activation Fee Revenue, Per Screen			$ 2,000
Activation fee revenue, lower range			1,000
Activation fee revenue, upper range			$ 2,000
Advertising costs						$ 348,000	$ 115,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares						$ 7.94	$ 20.40
Cashless exercise of stock options (in shares) | shares						2,500	14,100
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares						2,710,866,000	2,869,605
Up-front Payment Arrangement [Member]
Deferred Revenue Arrangement [Line Items]
Administrative Fee VPFs			10.00%
Services
Deferred Revenue Arrangement [Line Items]
Goodwill, Impairment Loss	0					$ 0	$ 0
Administrative Fee VPFs			5.00%
Incentive Fees, Percentage of VPF Phase I			2.50%
Content & Entertainment
Deferred Revenue Arrangement [Line Items]
Goodwill, Impairment Loss	0	$ (18,000,000)		(6,000,000)		(18,000,000)	(6,000,000)
Discount rate					17.00%
Long-term Debt | Accounting Standards Update 2015-03 [Member]
Deferred Revenue Arrangement [Line Items]
Deferred finance costs, net				6,700,000			6,700,000
Other Noncurrent Assets [Member] | Accounting Standards Update 2015-03 [Member]
Deferred Revenue Arrangement [Line Items]
Deferred finance costs, net				(6,700,000)			(6,700,000)
Estimate of Fair Value Measurement [Member]
Deferred Revenue Arrangement [Line Items]
Long-term debt, fair value	88,711,000			32,363,000		88,711,000	32,363,000
Long-term Debt, Percentage Bearing Variable Interest, Amount, Fair Value Disclosure	119,390,000			170,174,000		119,390,000	170,174,000
Reported Value Measurement [Member]
Deferred Revenue Arrangement [Line Items]
Long-term debt, fair value	87,380,000			31,573,000		87,380,000	31,573,000
Long-term Debt, Percentage Bearing Variable Interest, Amount, Fair Value Disclosure	$ 119,395,000			$ 171,769,000		119,395,000	$ 171,769,000
Class A common stock | Forward Contracts [Member]
Deferred Revenue Arrangement [Line Items]
Forward Contracts Indexed to Issuer's Equity, Indexed Shares | shares								1,179,138
Restatement Adjustment [Member]
Deferred Revenue Arrangement [Line Items]
Net cash provided by (used in) investing activities						800,000
Net cash provided by (used in) financing activities						$ (800,000)