LONG-TERM DEBT: (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
	Jul. 31, 2015	Jun. 30, 2015	Jun. 30, 2014	Mar. 31, 2015	Mar. 10, 2014
Long-term debt
Total long-term debt and capital leases		$ 271,988		$ 280,087
Less current installments		87,186		32,232
Long-term debt, excluding current installments		184,802		247,855
Existing debt repaid with proceeds of term loan		$ 8,099	$ 4,917
LIBOR rate (as a percent)		0.28%
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
Fair market value of the derivative		$ 0
Unrealized loss of the derivative recorded in other comprehensive income (loss)		$ 200
LIBOR | Interest rate swap | March 10, 2014 derivative agreement
Long-term debt
Long-term debt variable interest rate description		LIBOR
Credit Agreement
Long-term debt
Outstanding letters of credit		$ 2,100
Credit Agreement | ITO
Long-term debt
Proceeds from sale utilized to repay outstanding indebtedness	$ 55,000
Allocated interest expense		300	$ 300
Credit Agreement | ITO | Maximum
Long-term debt
Maximum amount of common stock that may be repurchased		100,000
Term loans
Long-term debt
Total long-term debt and capital leases		262,500		270,000
Aggregate amount of borrowing commitment		$ 300,000
Weighted-average interest rate on long-term debt (as a percent)		2.30%
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
Revolving credit facility dividend restrictions amount, maximum		$ 30,000
Revolving credit facility | LIBOR
Long-term debt
Long-term debt basis spread on variable interest rate (as a percent)		2.00%
Capital leases and installment payment obligations
Long-term debt
Total long-term debt and capital leases				63
Long-term debt stated interest rate percentage		4.00%
Other debt and long-term liabilities
Long-term debt
Total long-term debt and capital leases		$ 9,488		$ 10,024