INCOME TAXES: (Details 2) (USD $)	Mar. 31, 2013	Mar. 31, 2012
INCOME TAXES:
Undistributed earnings of foreign subsidiaries that are indefinitely reinvested	$ 38,100,000
Deferred tax assets:
Accrued expenses not currently deductible for tax purposes	9,183,000	11,228,000
Revenue recognized for tax purposes in excess of revenue for financial reporting purposes	4,314,000	3,878,000
Net operating loss and tax credit carryforwards	45,746,000	51,153,000
Other	11,945,000	10,410,000
Total deferred tax assets	71,188,000	76,669,000
Less valuation allowance	35,981,000	39,083,000
Net deferred tax assets	35,207,000	37,586,000
Deferred tax liabilities:
Intangible assets, principally due to differences in amortization	(66,959,000)	(64,798,000)
Costs capitalized for financial reporting purposes in excess of amounts capitalized for tax purposes	(24,825,000)	(26,072,000)
Investments, principally due to differences in basis for tax and financial reporting purposes	(44,000)
Property and equipment, principally due to differences in depreciation	(17,702,000)	(24,648,000)
Total deferred tax liabilities	(109,530,000)	(115,518,000)
Net deferred tax liability	$ (74,323,000)	$ (77,932,000)