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Stock Appreciation Rights Stock Appreciation Rights Vesting Schedule (Details) (Stock Appreciation Rights (SARs) [Member])
 9 Months Ended
Jan. 31, 2015
Stock Appreciation Rights (SARs) [Member]
  
Vesting Schedule [Line Items]  
Vested In Under One Year 0.00%ttlo_VestedInUnderOneYear
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Vested At Least One But Less Than Two Years 33.00%ttlo_VestedAtLeastOneButLessThanTwoYears
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Vested At Least Two But Less Than Three Years 67.00%ttlo_VestedAtLeastTwoButLessThanThreeYears
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember
Vested Three or More Years 100.00%ttlo_VestedThreeOrMoreYears
/ us-gaap_AwardTypeAxis
= us-gaap_StockAppreciationRightsSARSMember