INCOME TAXES: (Details 2) (USD $)	Mar. 31, 2012	Mar. 31, 2011
INCOME TAXES:
Undistributed earnings of foreign subsidiaries that are indefinitely reinvested	$ 33,200,000
Deferred tax assets:
Accrued expenses not currently deductible for tax purposes	11,228,000	12,531,000
Revenue recognized for tax purposes in excess of revenue for financial reporting purposes	3,878,000	1,718,000
Investments, principally due to differences in basis for tax and financial reporting purposes		2,050,000
Net operating loss and tax credit carryforwards	51,153,000	51,489,000
Other	10,410,000	13,554,000
Total deferred tax assets	76,669,000	81,342,000
Less valuation allowance	39,083,000	36,377,000
Net deferred tax assets	37,586,000	44,965,000
Deferred tax liabilities:
Intangible assets, principally due to differences in amortization	(64,798,000)	(68,140,000)
Costs capitalized for financial reporting purposes in excess of amounts capitalized for tax purposes	(26,072,000)	(33,339,000)
Property and equipment, principally due to differences in depreciation	(24,648,000)	(15,366,000)
Total deferred tax liabilities	(115,518,000)	(116,845,000)
Net deferred tax liability	$ (77,932,000)	$ (71,880,000)