SUMMARY OF ACCOUNTING POLICIES - Intangible Assets (Details) - USD ($)	1 Months Ended	12 Months Ended
	Mar. 31, 2016	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	Jun. 29, 2015
Components of acquired intangible assets
Intangible assets residual value	$ 0	$ 0
Gross Carrying Amount	508,099,000	508,099,000	$ 173,838,000
Accumulated Amortization	(104,345,000)	(104,345,000)	(92,294,000)
Net Carrying Amount	403,754,000	403,754,000	81,544,000
Intangible assets fully amortized and removed	51,700,000	51,700,000
Total intangible asset amortization expense		65,965,000	32,035,000	$ 28,892,000
Estimated future annual amortization expense for acquired intangible assets
2017	76,921,000	76,921,000
2018	62,474,000	62,474,000
2019	55,844,000	55,844,000
2020	47,252,000	47,252,000
2021	42,961,000	42,961,000
Thereafter	118,302,000	118,302,000
Net Carrying Amount	403,754,000	403,754,000	81,544,000
Customer-related intangibles
Components of acquired intangible assets
Gross Carrying Amount	223,046,000	223,046,000	133,853,000
Accumulated Amortization	(66,473,000)	(66,473,000)	(80,506,000)
Net Carrying Amount	156,573,000	156,573,000	53,347,000
Estimated future annual amortization expense for acquired intangible assets
Net Carrying Amount	156,573,000	$ 156,573,000	53,347,000
Customer-related intangibles | Maximum
Components of acquired intangible assets
Useful life		10 years
Customer-related intangibles | Weighted-average
Components of acquired intangible assets
Useful life		6 years 9 months 3 days
Customer-related intangibles | Mirror Controls International
Components of acquired intangible assets
Gross Carrying Amount					$ 75,500,000
Increase in intangible assets	75,500,000
Licenses and other intangibles
Components of acquired intangible assets
Gross Carrying Amount	285,053,000	$ 285,053,000	39,985,000
Accumulated Amortization	(37,872,000)	(37,872,000)	(11,788,000)
Net Carrying Amount	247,181,000	247,181,000	28,197,000
Estimated future annual amortization expense for acquired intangible assets
Net Carrying Amount	247,181,000	$ 247,181,000	$ 28,197,000
Licenses and other intangibles | Weighted-average
Components of acquired intangible assets
Useful life		7 years 6 months
Licenses and other intangibles | Mirror Controls International
Components of acquired intangible assets
Gross Carrying Amount					$ 161,300,000
Increase in intangible assets	$ 161,300,000