LONG-TERM DEBT: (Details) - USD ($) $ in Thousands		12 Months Ended
	Jul. 31, 2015	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014	May. 19, 2015	Mar. 10, 2014
Long-term debt
Total long-term debt and capital leases		$ 192,856	$ 280,087
Less current installments		32,243	32,232
Less deferred debt financing costs		2,716	3,102
Long-term debt, excluding current installments and deferred debt financing costs		157,897	244,753
Long-term debt		157,897	244,753
Maximum amount of common stock that may be repurchased					$ 300,000
Discontinued operations, held-for-sale or disposed of by sale | ITO
Long-term debt
Interest expense		681
March 10, 2014 derivative agreement | Cash flow hedge | Other, net
Long-term debt
Unrealized loss of the derivative recorded in other comprehensive income (loss)		$ 100
Interest rate swap | March 10, 2014 derivative agreement | Cash flow hedge
Long-term debt
Fixed interest rate payable on swap (as a percent)						0.98%
Notional amount of derivative						$ 50,000
LIBOR rate (as a percent)		0.63%
Amount of ineffectiveness		$ 0
Fair market value of the derivative		0
Credit Agreement
Long-term debt
Outstanding indebtedness repaid with proceeds from sale	$ 55,000
Credit Agreement | ITO | Maximum
Long-term debt
Maximum amount of common stock that may be repurchased		100,000
Credit Agreement | Discontinued operations, held-for-sale or disposed of by sale | ITO
Long-term debt
Interest expense		400	1,300	$ 1,700
Term loans
Long-term debt
Total long-term debt and capital leases		185,000	270,000
Aggregate amount of borrowing commitment		$ 300,000
Weighted-average interest rate on long-term debt (as a percent)		2.68%
Term loans | Quarterly installments payable through September 2017
Long-term debt
Required quarterly installment payments		$ 7,500
Term loans | Quarterly installments payable through June 2018
Long-term debt
Required quarterly installment payments		11,300
Term loans | Final payment due on October 9, 2018
Long-term debt
Final payment of long-term debt		$ 106,300
Term loans | LIBOR
Long-term debt
Long-term debt basis spread on variable interest rate (as a percent)		2.00%
Revolving credit facility
Long-term debt
Aggregate amount of borrowing commitment		$ 300,000
Outstanding revolving credit borrowings		0	0
Outstanding letters of credit		2,100
Revolving credit facility dividend restrictions amount, maximum		30,000
Other debt and long-term liabilities
Long-term debt
Total long-term debt and capital leases		$ 7,856	$ 10,087