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Inventories (Detail) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2015
Jun. 30, 2014
Inventory [Line Items]    
Component parts $ 16,416nssc_InventoryComponentPartsCurrentAndNoncurrentNetOfReserves $ 15,268nssc_InventoryComponentPartsCurrentAndNoncurrentNetOfReserves
Work-in-process 3,905nssc_InventoryWorkInProcessCurrentAndNoncurrentNetOfReserves 3,632nssc_InventoryWorkInProcessCurrentAndNoncurrentNetOfReserves
Finished product 6,570nssc_InventoryFinishedGoodsCurrentAndNoncurrentNetOfReserves 6,110nssc_InventoryFinishedGoodsCurrentAndNoncurrentNetOfReserves
Total Inventory 26,891nssc_InventoryCurrentAndNoncurrentNetOfReserves 25,010nssc_InventoryCurrentAndNoncurrentNetOfReserves
Classification of inventories, net of reserves:    
Current 22,886us-gaap_InventoryNet 21,443us-gaap_InventoryNet
Non-current 4,005us-gaap_InventoryNoncurrent 3,567us-gaap_InventoryNoncurrent
Total Inventory $ 26,891nssc_InventoryCurrentAndNoncurrentNet $ 25,010nssc_InventoryCurrentAndNoncurrentNet